Placebo tablet administered orally

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

Participants assessed their pelvic pain not related to menses and its impact on their daily activities at approximately the same time every day in an e-Diary according to the following response options:

• 0 = No pelvic pain
• 1 = Mild pelvic pain; subject could not do some of the things she usually does
• 2 = Moderate pelvic pain; subject could not do many of the things she usually does
• 3 = Severe pelvic pain; subject could not do most or all of the things she usually does.

The monthly mean non-menstrual pelvic pain score is the average of the daily values reported during the 4 weeks prior to each visit.

Participants assessed dysmenorrhea (pain during menstruation) and its impact on their daily activities at approximately the same time each day in an e-Diary according to the following response options:

• Subject is not having her period
• 0 = No pain related to period
• 1 = Mild pain related to period; subject could not do some of the things she usually does
• 2 = Moderate pain related to period; subject could not do many of the things she usually does
• 3 = Severe pain related to period; subject could not do most of or all of the things she usually does.

The monthly mean dysmenorrhea score is the average of the daily values reported during the 4 weeks prior to each visit.

Participants assessed dysmenorrhea and pelvic pain not related to menses and their impact on daily activities at approximately the same time every day on a 4-point scale (0 = none, 1 = mild, 2 = moderate, and 3 = severe) in an e-Diary.

The sum of the dysmenorrhea and non-menstrual pelvic pain scores on each day were calculated to create a daily total score. On days the participant was not having her period, the dysmenorrhea score was not defined; hence, the total score was equal to the non-menstrual pelvic pain score (range 0 to 3). On days where the participant recorded menstruation the total score ranged from 0 to 6, where higher scores indicate more severe pain. The monthly mean sum of dysmenorrhea and non-menstrual pelvic pain scores is the average of the daily values reported during the 4 weeks prior to each visit.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The percentage of days a participant reported a value of zero (or "no pain") for the NRS was calculated for the 4 weeks prior to each visit.

Participants assessed their pelvic pain not related to menses and its impact on their daily activities at approximately the same time every day in an e-Diary according to the following response options:

• 0 = No pelvic pain
• 1 = Mild pelvic pain; subject could not do some of the things she usually does
• 2 = Moderate pelvic pain; subject could not do many of the things she usually does
• 3 = Severe pelvic pain; subject could not do most or all of the things she usually does.

The percentage of days a participant reported a value of zero ("no pain") for non-menstrual pelvic pain was calculated for the 4 weeks prior to each visit.

Participants assessed dysmenorrhea (pain during menstruation) and its impact on their daily activities at approximately the same time each day in an e-Diary according to the following response options:

• Subject is not having her period
• 0 = No pain related to period
• 1 = Mild pain related to period; subject could not do some of the things she usually does
• 2 = Moderate pain related to period; subject could not do many of the things she usually does
• = Severe pain related to period; subject could not do most of or all of the things she usually does.

The percentage of days a participant reported a value of zero ("no pain") for dysmenorrhea was calculated for the 4 weeks prior to each visit.

Participants assessed dysmenorrhea and pelvic pain not related to menses and their impact on daily activities at approximately the same time every day in an e-Diary on a 4-point scale (0 = none, 1 = mild, 2 = moderate, and 3 = severe). The sum of the dysmenorrhea and non-menstrual pelvic pain scores on each day were calculated to create a daily total score. On days the participant was not having her period, the dysmenorrhea score was not defined; hence, the total score was equal to the non-menstrual pelvic pain score (range 0 to 3). On days where the participant recorded menstruation the total score ranged from 0 to 6, where higher scores indicate more severe pain.

The percentage of days a participant reported a value of zero ("no pain") for the non-menstrual pelvic pain and dysmenorrhea total score was calculated for the 4 weeks prior to each visit.

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of any analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of an analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of prescription analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of a prescription analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of narcotic analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of a narcotic analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly mean NRS is the average of the daily values reported during the 4 weeks prior to each visit.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly mean NRS is the average of the daily values reported during the 4 weeks prior to each visit.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

The CPSSS consists of 5 components that address dysmenorrhea, dyspareunia, non-menstrual pelvic pain, pelvic tenderness, and pelvic induration. To assess dyspareunia (painful intercourse) participants were asked to select the best description of pain during sexual intercourse over the past 28 days using the following response categories:

• 0 = Absent; No discomfort during sexual intercourse.
• 1 = Mild; I can tolerate the discomfort during sexual intercourse.
• 2 = Moderate; Intercourse is sometime interrupted due to pain.
• 3 = Severe; I prefer to avoid intercourse because of pain.
• Not applicable. I am not sexually active for reasons other than my endometriosis symptoms.

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

The EHP-5 is an instrument to measure health-related quality of life in women with endometriosis. The EHP-5 consists of two parts:

• A core questionnaire consisting of five questions that measure the areas of pain, control and powerlessness, emotional well-being, social support, and self-image with five response categories for each item (Never, Rarely, Sometimes, Often, Always)
• A supplemental questionnaire consisting of six additional questions which assess the areas of work, relationship with children, sexual intercourse, feelings about the medical profession, treatment, and infertility with the same five response categories plus an additional response category of Not Relevant which was not scored.

The scores associated with each possible outcome category are as follows: never (0), rarely (25), sometimes (50), often (75), and always (100). A negative change from baseline score indicates improvement in quality of life.

Bone mineral density (BMD) of the femur (total hip) was measured by dual-energy X-ray absorptiometry (DXA).

Bone mineral density (BMD) of the femur (total hip) was measured by dual-energy X-ray absorptiometry (DXA).

Bone mineral density (BMD) of the spine was measured by dual-energy X-ray absorptiometry (DXA).

Bone mineral density (BMD) of the spine was measured by dual-energy X-ray absorptiometry (DXA).

Participants received elagolix 250 mg tablets once a day for 12 weeks. At the end of 12 weeks participants continued to receive elagolix 250 mg for an additional 12 weeks.

Total of all reporting groups

Participants received elagolix 150 mg tablets once a day for 12 weeks. At the end of 12 weeks participants continued to receive elagolix 150 mg QD for an additional 12 weeks.

Participants received elagolix 250 mg tablets once a day for 12 weeks. At the end of 12 weeks participants continued to receive elagolix 250 mg for an additional 12 weeks.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly mean NRS is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed their pelvic pain not related to menses and its impact on their daily activities at approximately the same time every day in an e-Diary according to the following response options:

• 0 = No pelvic pain
• 1 = Mild pelvic pain; subject could not do some of the things she usually does
• 2 = Moderate pelvic pain; subject could not do many of the things she usually does
• 3 = Severe pelvic pain; subject could not do most or all of the things she usually does.

The monthly mean non-menstrual pelvic pain score is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed dysmenorrhea (pain during menstruation) and its impact on their daily activities at approximately the same time each day in an e-Diary according to the following response options:

• Subject is not having her period
• 0 = No pain related to period
• 1 = Mild pain related to period; subject could not do some of the things she usually does
• 2 = Moderate pain related to period; subject could not do many of the things she usually does
• 3 = Severe pain related to period; subject could not do most of or all of the things she usually does.

The monthly mean dysmenorrhea score is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed dysmenorrhea and pelvic pain not related to menses and their impact on daily activities at approximately the same time every day on a 4-point scale (0 = none, 1 = mild, 2 = moderate, and 3 = severe) in an e-Diary.

The sum of the dysmenorrhea and non-menstrual pelvic pain scores on each day were calculated to create a daily total score. On days the participant was not having her period, the dysmenorrhea score was not defined; hence, the total score was equal to the non-menstrual pelvic pain score (range 0 to 3). On days where the participant recorded menstruation the total score ranged from 0 to 6, where higher scores indicate more severe pain. The monthly mean sum of dysmenorrhea and non-menstrual pelvic pain scores is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The percentage of days a participant reported a value of zero (or "no pain") for the NRS was calculated for the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed their pelvic pain not related to menses and its impact on their daily activities at approximately the same time every day in an e-Diary according to the following response options:

• 0 = No pelvic pain
• 1 = Mild pelvic pain; subject could not do some of the things she usually does
• 2 = Moderate pelvic pain; subject could not do many of the things she usually does
• 3 = Severe pelvic pain; subject could not do most or all of the things she usually does.

The percentage of days a participant reported a value of zero ("no pain") for non-menstrual pelvic pain was calculated for the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed dysmenorrhea (pain during menstruation) and its impact on their daily activities at approximately the same time each day in an e-Diary according to the following response options:

• Subject is not having her period
• 0 = No pain related to period
• 1 = Mild pain related to period; subject could not do some of the things she usually does
• 2 = Moderate pain related to period; subject could not do many of the things she usually does
• = Severe pain related to period; subject could not do most of or all of the things she usually does.

The percentage of days a participant reported a value of zero ("no pain") for dysmenorrhea was calculated for the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Participants assessed dysmenorrhea and pelvic pain not related to menses and their impact on daily activities at approximately the same time every day in an e-Diary on a 4-point scale (0 = none, 1 = mild, 2 = moderate, and 3 = severe). The sum of the dysmenorrhea and non-menstrual pelvic pain scores on each day were calculated to create a daily total score. On days the participant was not having her period, the dysmenorrhea score was not defined; hence, the total score was equal to the non-menstrual pelvic pain score (range 0 to 3). On days where the participant recorded menstruation the total score ranged from 0 to 6, where higher scores indicate more severe pain.

The percentage of days a participant reported a value of zero ("no pain") for the non-menstrual pelvic pain and dysmenorrhea total score was calculated for the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of any analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of an analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of prescription analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of a prescription analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The daily use of endometriosis analgesics was reported by participants daily using the e-Diary. Participants reported whether the medication was over-the-counter (OTC) or prescription, and, if prescription, whether the medication was a narcotic.

The percentage of days of narcotic analgesic use is defined as the number of days in the 4 weeks prior to each study visit that the participant reported the use of a narcotic analgesic, divided by the number of study days in the interval that the participant provided an e-Diary report regarding the use of endometriosis analgesics (including a response of "none").

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly mean NRS is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly mean NRS is the average of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The NRS is an 11-point scale used to measure endometriosis pain and was completed at approximately the same time each day using an electronic diary (e-Diary). Participants were instructed to select a single number between 0 (No pain) and 10 (Worst pain ever) that best described their endometriosis pain at its worst over the past day.

The monthly peak NRS is the maximum of the daily values reported during the 4 weeks prior to each visit.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The CPSSS consists of 5 components that address dysmenorrhea, dyspareunia, non-menstrual pelvic pain, pelvic tenderness, and pelvic induration. To assess dyspareunia (painful intercourse) participants were asked to select the best description of pain during sexual intercourse over the past 28 days using the following response categories:

• 0 = Absent; No discomfort during sexual intercourse.
• 1 = Mild; I can tolerate the discomfort during sexual intercourse.
• 2 = Moderate; Intercourse is sometime interrupted due to pain.
• 3 = Severe; I prefer to avoid intercourse because of pain.
• Not applicable. I am not sexually active for reasons other than my endometriosis symptoms.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The Patient Global Impression of Change (PGIC) is a questionnaire-based assessment of the change in endometriosis pain since the initiation of study drug. The participant was asked to select from one of seven response categories:

1. Very Much Improved
2. Much Improved
3. Minimally Improved
4. Not Changed
5. Minimally Worse
6. Much Worse
7. Very Much Worse

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

The EHP-5 is an instrument to measure health-related quality of life in women with endometriosis. The EHP-5 consists of two parts:

• A core questionnaire consisting of five questions that measure the areas of pain, control and powerlessness, emotional well-being, social support, and self-image with five response categories for each item (Never, Rarely, Sometimes, Often, Always)
• A supplemental questionnaire consisting of six additional questions which assess the areas of work, relationship with children, sexual intercourse, feelings about the medical profession, treatment, and infertility with the same five response categories plus an additional response category of Not Relevant which was not scored.

The scores associated with each possible outcome category are as follows: never (0), rarely (25), sometimes (50), often (75), and always (100). A negative change from baseline score indicates improvement in quality of life.

All randomized participants who received at least one dose of randomized, double-blind study drug and reported at least 10 e-Diary NRS values during the initial 12 week treatment period. The analysis includes participants with non-missing data at each time point.

Bone mineral density (BMD) of the femur (total hip) was measured by dual-energy X-ray absorptiometry (DXA).

All randomized participants who received at least one dose of randomized, double-blind study drug and with available BMD data at baseline and week 12.

Bone mineral density (BMD) of the femur (total hip) was measured by dual-energy X-ray absorptiometry (DXA).

All randomized participants who received at least one dose of randomized, double-blind study drug and with available BMD data at baseline and week 24.

Bone mineral density (BMD) of the spine was measured by dual-energy X-ray absorptiometry (DXA).

All randomized participants who received at least one dose of randomized, double-blind study drug and with available BMD data at baseline and week 12.

Bone mineral density (BMD) of the spine was measured by dual-energy X-ray absorptiometry (DXA).

All randomized participants who received at least one dose of randomized, double-blind study drug and with available BMD data at baseline and week 24.

Participants initially randomized to elagolix 150 mg received elagolix 150 mg tablets once a day and placebo intramuscular injection once a month for 12 weeks. At the end of 12 weeks participants continued to receive elagolix 150 mg for an additional 12 weeks.

Participants initially randomized to placebo were re-randomized at week 12 to receive elagolix 150 mg for 12 weeks.

Participants initially randomized to elagolix 250 mg received elagolix 250 mg tablets once a day and placebo intramuscular injection once a month for 12 weeks. At the end of 12 weeks participants continued to receive elagolix 250 mg for an additional 12 weeks.

Participants initially randomized to placebo were re-randomized at week 12 to receive elagolix 250 mg for 12 weeks.

Analysis at week 4. Change from baseline in in monthly mean values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in in monthly mean values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in in monthly mean values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 4. Change from baseline in in monthly peak values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in in monthly peak values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in in monthly peak values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 12. Change from baseline in in monthly peak values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 12. Change from baseline in in monthly peak values of the NRS for overall endometriosis-associated pelvic pain was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 4. Change from baseline in non-menstrual pelvic pain score was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in non-menstrual pelvic pain score was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo

Analysis at week 8. Change from baseline in non-menstrual pelvic pain score was analyzed by a repeated measures analysis of covariance model. The model included fixed effects for treatment, time, the treatment-by-time interaction, a random effect for subject, and the baseline-by-time interaction, and the baseline value as a covariate.

Difference = Elagolix - Placebo