Table 1 Characteristics of breast cancer cases and controls
General characteristic | Cases (n = 286) | Controls (n = 535) |
|---|---|---|
Age at blood draw (years)a | 66.0 (8.1) | 66.0 (8.0) |
Fasting hours prior to blood drawa | 13.1 (1.9) | 13.0 (1.8) |
Current hormone therapy usea | 99 (35%) | 185 (35%) |
Ethnicitya | ||
African American | 35 (12%) | 65 (12%) |
Caucasian | 59 (21%) | 111 (21%) |
Japanese American | 116 (40%) | 213 (40%) |
Latina | 45 (16%) | 86 (16%) |
Native Hawaiian | 31 (11%) | 60 (11%) |
High school education or less | 97 (34%) | 189 (35%) |
Body mass index (kg/m2) | 25.6 (4.9) | 25.4 (5.4) |
Nulliparous | 35 (12%) | 58 (11%) |
Number of full-term pregnancies | 2.7 (1.8) | 2.8 (1.8) |
Age at first childbirth | 23.8 (4.6) | 23.5 (4.5) |
Age at menarche | 13.0 (1.6) | 13.1 (1.6) |
Age at natural menopause | 49.1 (5.1) | 49.5 (4.7) |
Smoking status | ||
Never | 159 (56%) | 334 (63%) |
Former | 90 (32%) | 146 (27%) |
Current | 35 (12%) | 52 (10%) |
Pack-years of smoking | 6.2 (11.2) | 5.4 (11.0) |
Mother or sister with breast cancer | 31 (11%) | 68 (13%) |
Alcohol use | ||
Never | 170 (60%) | 347 (65%) |
Ever, below users' median (< 3.4 g/day) | 58 (20%) | 95 (18%) |
Ever, above users' median (> 3.4 g/day) | 58 (20%) | 93 (17%) |
Hours in moderate or vigorous physical activity per day | 1.2 (1.3) | 1.2 (1.3) |