The four HPV types were determined by polymerase chain reaction (PCR) testing. VIN = vulvar intraepithelial neoplasia; VaIN = vaginal intraepithelial neoplasia; AIS = adenocarcinoma in situ.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the relevant HPV type at Day 1 and PCR negative to the relevant HPV type Day 1 through Month 7, and provided follow-up data after Month 7

An adverse event (AE) is any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study vaccine. Any worsening of a preexisting condition which is temporally associated with the use of the study vaccine is also an adverse event. A serious adverse event (SAE) is an AE that results in death, is life threatening, results in persistent or significant disability or incapacity, results in or prolongs a hospitalization, is a congenital anomaly or birth defect, is a cancer, or is an overdose. Vaccine-related SAEs are those deemed by the investigator to be definitely, probably, or possibly related to study vaccine.

Participants who received >=1 qHPV vaccination or placebo injection in the Base Study and had safety follow-up

An adverse event (AE) is any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study vaccine. Any worsening of a preexisting condition which is temporally associated with the use of the study vaccine is also an adverse event. A serious adverse event (SAE) is an AE that results in death, is life threatening, results in persistent or significant disability or incapacity, results in or prolongs a hospitalization, is a congenital anomaly or birth defect, is a cancer, or is an overdose. Vaccine-related SAEs are those deemed by the investigator to be definitely, probably, or possibly related to study vaccine.

Participants who received >=1 qHPV vaccination in the Base Study or EXT1 and had safety follow-up

An adverse event (AE) is any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study vaccine. Any worsening of a preexisting condition which is temporally associated with the use of the study vaccine is also an adverse event. A serious adverse event (SAE) is an AE that results in death, is life threatening, results in persistent or significant disability or incapacity, results in or prolongs a hospitalization, is a congenital anomaly or birth defect, is a cancer, or is an overdose.

Participants who received >=1 qHPV vaccination in the Base Study or EXT1 and had safety follow-up

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Day 1 to Year 4, conditional on having been event-free at Day 1.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 4 to Year 8, conditional on having been event-free from Day 1 to Year 4. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 6 to Year 10, conditional on having been event-free from Day 1 to Year 6.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to the HPV Types were determined by Competitive Luminex Immunoassay (cLIA). Geometric Mean Titers (GMT) are reported in milli-Merck Units/mL (mMU/mL). This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

Serum antibodies to HPV Types 6, 11, 16, and 18 were determined by Competitive Luminex Immunoassay (cLIA). The seropositive thresholds (in mMU/mL) were >20 for Type 6, >16 for Type 11, >20 for Type 16, and >24 for Type 18. This Outcome Measure evaluated age-specific immunogenicity responses, and applied only to participants who received qHPV in the Base Study.

Participants who received ≥1 qHPV vaccination. n = participants who were seronegative to the HPV type on Day 1 and PCR negative to the HPV type through Month 7, received 3 doses of qHPV, had a valid postdose 3 serology result for the HPV type, and did not fail any exclusion criteria pertinent to immunogenicity.

HPV 6/11: The two types of HPV (types 6/11) were determined by PCR testing

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the relevant HPV type at Day 1 and PCR negative to the relevant HPV type Day 1 through Month 7, and provided follow-up data after Month 7

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Day 1 to Year 4 conditional on having been event-free at Day 1.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 4 to Year 8 conditional on having been event-free from Day 1 to Year 4. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 6 to Year 10 conditional on having been event-free from Day 1 to Year 6.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 6 to Year 10 conditional on having been event-free from Day 1 to Year 6.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.

This outcome measure was not analyzed because of diminished interest by experts in composite efficacy endpoints associated with these HPV types

HPV 16/18: The two types of HPV (types 16/18) were determined by PCR testing

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the relevant HPV type at Day 1 and PCR negative to the relevant HPV type Day 1 through Month 7, and provided follow-up data after Month 7

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Day 1 to Year 4 conditional on having been event-free at Day 1.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 4 to Year 8 conditional on having been event-free from Day 1 to Year 4. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing. Cumulative incidence probability is the probability of becoming an endpoint case at any time from Year 6 to Year 10 conditional on having been event-free from Day 1 to Year 6.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data.

The four HPV types were determined by PCR testing. The analysis windows were cut at the exact time points, e.g., Year 4. Visits and events which occurred after Year 4 due to visit window or follow-up investigations are included in the Year 4 to Year 8 time interval.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 4. This Outcome Measure applied only to participants who received qHPV in the Base Study.

The four HPV types were determined by PCR testing.

Participants who had no major protocol violations, received all 3 vaccinations, were seronegative to the HPV types at Day 1 and PCR negative to the HPV types through Month 7, and provided follow-up data after Year 6. This Outcome Measure applied only to participants who received qHPV in the Base Study.