Table 2.

Characteristics of cases and controls included in the pooled analysisa

Controls (N = 9,859)Cases (N = 8,525)
Mean (STD) or N (%)Mean (STD) or N (%)
Age55 (12)55 (12)
Oral contraceptive use
 Never2,995 (30)3,411 (40)
 Ever6,864 (70)5,114 (60)
Parous
 No1,468 (15)2,196 (26)
 Yes8,391 (85)6,329 (74)
Tubal ligation
 No7,359 (75)6,994 (82)
 Yes2,500 (25)1,531 (18)
BMI26.5 (6.1)27.0 (6.6)
Race/ethnicity
 Non-Hispanic White8,629 (88)7,433 (87)
 Hispanic White197 (2)214 (3)
 Black273 (3)268 (3)
 Asian350 (4)313 (4)
 Otherb407 (4)291 (4)
Powder usec
 Never use5,815 (59)4,643 (54)
 Non-genital use only1,533 (16)1,282 (15)
 Genital use2,511 (25)2,600 (31)
  • aAll characteristics listed except age differed significantly (<0.01) between cases and controls. Cases include both borderline and invasive ovarian cancers.

  • bThere are 6 cases and 3 controls missing race/ethnicity information.

  • cCategories for non-genital and genital powder use are mutually exclusive.