Table 1.
Characteristics of the cohort studies included in the pooled analyses of vitamin intake and ovarian cancer risk
| Study | Follow-up period | Baseline age range (years) | Baseline cohort size1 | No. of cases2 |
|---|---|---|---|---|
| Breast Cancer Detection Demonstration Project Follow-up Cohort (BCDDP) | 1987-1999 | 40-93 | 32,885 | 142 |
| Canadian National Breast Screening Study (CNBSS) | 1980-2000 | 40-59 | 49,613 | 223 |
| Cancer Prevention Study II Nutrition Cohort (CPS II) | 1992-2001 | 50-74 | 61,201 | 278 |
| Iowa Women's Health Study (IWHS) | 1986-2001 | 55-69 | 28,486 | 208 |
| Netherlands Cohort Study (NLCS) | 1986-1995 | 55-69 | 62,412 | 208 |
| New York State Cohort (NYSC) | 1980-1987 | 50-93 | 22,550 | 77 |
| New York University Women's Health Study (NYUWHS) | 1985-1998 | 34-65 | 12,401 | 65 |
| Nurses’ Health Study (a) (NHSa) | 1980-1986 | 34-59 | 80,195 | 120 |
| Nurses’ Health Study (b) (NHSb) | 1986-2002 | 40-65 | 59,5383 | 315 |
| Nurses’ Health Study II (NHS II) | 1991-2000 | 27-44 | 91,514 | 52 |
| Swedish Mammography Cohort (SMC) | 1987-2004 | 40-74 | 60,600 | 285 |
Cohort sizes after applying study-specific exclusion criteria and then excluding women with loge-transformed energy intake values greater than three standard deviations from the study-specific mean, with previous cancer diagnoses (other than nonmelanoma skin cancer) and who had previously had a bilateral oophorectomy (except in the New York State Cohort where this information was not collected); the Canadian National Breast Screening Study and the Netherlands Cohort Study are analyzed as case-cohort studies so their baseline cohort size does not reflect the above exclusions; total cohort size is 501,857
Total number of cases is 1,973
Nurses’ Health Study (b) is not included as part of total cohort size since they are a subset of the women in Nurses’ Health Study (a)