Table 1.

Study groups: median ages of breast and ovarian cancer diagnosis of cases and of controls at the time of matching

No. case-control pairsRisk factor data availableMedian age of cancer diagnosis (range)Median age of controls at the time of matching (range)*
Breast cancer case-control pairs
    258 (total)40 (22-74)45 (24-77)
        177Yes40 (24-74)45 (28-77)
        81No39 (22-62)45 (24-75)
    161 (unrelated only)39 (25-74)45 (26-77)
        109Yes40 (25-74)45 (28-77)
        52No38 (26-62)44 (26-69)
Ovarian cancer case-control pairs
    127 (total)46 (25-71)49 (30-75)
        83Yes45 (25-71)49 (31-73)
        44No48 (27-71)51 (38-75)
    100 (unrelated only)46 (27-71)49 (30-73)
        61Yes46 (34-71)49 (36-73)
        39No48 (27-69)51 (30-70)
  • * The median age difference between cases and controls was a result of matching the pairs by year of birth such that the age of the controls is the current age and for cases is the age of diagnosis. One hundred and twenty-four of the controls were used as controls for both breast cancer cases and ovarian cancer cases.