Table 1.

Description of the parent cohorts

CohortCohort sizeNumber of ovarian cases/controlsAge at enrollmentEnrollment periodRecruitmentSample typeQuestionnaireCase ascertainment
NYUWHS14,274 women82/16335–651985–1991Breast cancer-screening center, New York CitySerumSelf-administered enrollment questionnaire, Ongoing mailed follow-up questionnairesMailed follow-up questionnaires with medical record review, Linkages to state tumor registries (NY, NJ, FL)
ORDET10,788 women41/8235–691987–1992Population-based, Varese province, Northern ItalySerumEnrollment interviewLinkage with Lombardy Cancer Registry
NSHDS>85,000 men and women107/18730–701985–presentPopulation based, Northern SwedenEDTA plasmaSelf-administered enrollment questionnaire, Mailed follow-up questionnaireLinkage with Swedish Cancer Registry