Table 1

Descriptive characteristics of breast cancer cases (n = 1263) and controls (n = 2269) in the MEC

Ethnicity
African AmericansJapaneseLatinasWhites
Cases (n = 278)Controls (n = 672)Cases (n = 358)Controls (n = 429)Cases (n = 272)Controls (n = 706)Cases (n = 355)Controls (n = 462)
Age (mean) (yrs)64.164.364.464.263.962.864.762.3
Menopausal status (%)
 Premenopausal141113211011820
 Postmenopausala5556676266616661
 Simple hysterectomy1923101014191714
 Missing111011810985
HRT use (%)a,b
 Never4748282944482834
 Past2923161521191717
 Current2126565331285548
Age at menarche (%)b (yrs)
 ≤125446565048495548
 13–143439323537393544
 15+1214914131188
No. of children (%)b
 0121116111071816
 12016111086119
 2 or 34040546036365153
 4+2532171845501922
Age at first birth (%)b,c (yrs)
 <20465081135422323
 21–304441747553526663
 31+851412941012
First-degree family history of breast cancer (%)b
 Yes231218111710159
 No7282778775838188
Average alcohol consumption (drinks/day)b
 05153727554533139
 <12930191732333940
 ≥1101053562218
  • a Women reporting natural menopause or having had a bilateral oophorectomy.

  • b Percentages do not add up to 100% because of missing data.

  • c Among parous women.