Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(4)/(total number of 91-day cycles)

Pregnancy Intent-to-Treat Population (PITT) of participants who were 18 to 35 years of age when study treatment started. The 'All Users' set included PITT participants who completed at least one 91-day cycle.

Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(4)/(total number of 91-day cycles)

Pregnancy Intent-to-Treat Population (PITT) of participants who were 18 to 35 years of age when study treatment started. The 'Typical-Use' set included PITT participants who completed at least one 91-day cycle and no other birth control methods including condoms were used.

Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(4)/(total number of 91-day cycles)

'Compliant-Use' set included PITT participants who completed at least one 91-day cycle and no other birth control methods were used. Cycles were excluded if a subject 1) skipped 2 or more consecutive combination pills, 2) had a pattern of substantial non-compliance with treatment, or 3) used a prohibited concomitant medication

A life table approach was used to estimate the cumulative pregnancy rate on a cycle-by-cycle basis for each of the four 91-day treatment cycles.

Pregnancy Intent-to-Treat Population (PITT) of participants who were 18 to 35 years of age when study treatment started. The 'All Users' set included PITT participants who completed at least one 91-day cycle.

Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

In order to compare the efficacy of extended treatment with DR-103 to conventional 28-day cyclic oral contraceptive treatment, the 91-day DR-103 treatment cycle was separated into three 28-day cycle-equivalents, derived from the 84-day active combination (EE/LNG) pill period of each 91-day extended cycle.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(13)/(total number of 28-day cycles)

Pregnancy Intent-to-Treat Population (PITT) of participants who were 18 to 35 years of age when study treatment started. The 'All Users' set included PITT participants who completed at least one 28-day cycle.

Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

In order to compare the efficacy of extended treatment with DR-103 to conventional 28-day cyclic oral contraceptive treatment, the 91-day DR-103 treatment cycle was separated into three 28-day cycle-equivalents, derived from the 84-day active combination (EE/LNG) pill period of each 91-day extended cycle.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(13)/(total number of 28-day cycles)

Pregnancy Intent-to-Treat Population (PITT) of participants who were 18 to 35 years of age when study treatment started. The 'Typical-Use' set included PITT participants who completed at least one 28-day cycle and no other birth control methods including condoms were used.

Contraceptive failure is measured by the pregnancy rate calculated using the Pearl Index (PI). PI used all pregnancies, as determined by a positive urine and/or serum pregnancy test, except those for which the date of conception was before starting DR-103 or > 7 days after stopping the combination EE/LNG treatment of DR-103. The estimated date of conception and gestational age of the fetus was determined by transvaginal or abdominal ultrasound.

In order to compare the efficacy of extended treatment with DR-103 to conventional 28-day cyclic oral contraceptive treatment, the 91-day DR-103 treatment cycle was separated into three 28-day cycle-equivalents, derived from the 84-day active combination (EE/LNG) pill period of each 91-day extended cycle.

The PI is defined as number of contraceptive failures per 100 women-years of exposure:

(100)*(total number of pregnancies)*(13)/(total number of 28-day cycles)

'Compliant-Use' set included PITT participants who completed at least one 28-day cycle and no other birth control methods were used. Cycles were excluded if a subject 1) skipped 2 or more consecutive combination pills, 2) had a pattern of substantial non-compliance with treatment, or 3) used a prohibited concomitant medication

The on-treatment time frame spanned the time during which study drug was administered until 3 weeks beyond the last study drug date.

Relationship to study drug was assessed by the investigator.

Serious AEs (SAEs) are those that resulted in death, were life-threatening, required or prolonged inpatient hospitalization, resulted in persistent or significant disability/incapacity, congenital anomaly, or resulted in an important medical event that may have jeopardized the patient or required medical or surgical intervention.

Safety population of treated participants

A life table approach was used to estimate the cumulative pregnancy rate on a cycle-by-cycle basis for each of the four 91-day treatment cycles.

'Compliant-Use' set included PITT participants who completed at least one 91-day cycle and no other birth control methods were used. Cycles were excluded if a subject 1) skipped 2 or more consecutive combination pills, 2) had a pattern of substantial non-compliance with treatment, or 3) used a prohibited concomitant medication