Table 1.
Demographic characteristics of the two random sub-cohorts in the Sister Study.
| Characteristics | Random sub-cohort 1 (N = 491) |
Random sub-cohort 2 (N = 882) |
|---|---|---|
| Age (year) | ||
| Mean ± SD | 55.8 ± 8.9 | 56.7 ± 8.8 |
| Missing | 0 | 0 |
| Body mass index (kg/m2) | ||
| Mean ± SD | 27.0 ± 5.5 | 27.4 ± 6.0 |
| Missing | 0 | 0 |
| Alcohol consumption in last year; N (%) | ||
| Never/former drinker | 82 (16.7) | 139 (15.8) |
| Current drinker, <1 drink/d | 336 (68.4) | 623 (70.9) |
| Current drinker, ≥1 drink/d | 73 (14.9) | 117 (13.3) |
| Missing | 0 | 3 |
| Education level; N (%) | ||
| High school or less | 61 (12.5) | 146 (16.6) |
| Some college | 154 (31.4) | 284 (32.2) |
| Bachelor’s degree | 142 (29.0) | 243 (27.6) |
| Graduate degree | 133 (27.1) | 209 (23.7) |
| Missing | 1 | 0 |
| Maternal Smoking; N (%) | ||
| Yes (Definitely or probably) | 142 (29.8) | 265 (31.5) |
| No (Definitely or probably) | 334 (70.2) | 576 (68.5) |
| Missing | 15 | 41 |
SD: standard deviation.