Table 1.
Baseline Characteristics in a Matched Case-Control Studya Nested in the Black Women's Health Study, 1997–2009
| Variable | Adenoma Cases (n = 917) |
Polyp-Free Controls (n = 2,751) |
||
|---|---|---|---|---|
| Mean (SD) | % | Mean (SD) | % | |
| Age, years | 54.6 (8.5) | 54.6 (8.5) | ||
| Body mass indexb | 30.1 (6.7) | 29.8 (6.4) | ||
| Education | ||||
| ≤12 years | 17 | 19 | ||
| 13–15 | 30 | 32 | ||
| ≥16 | 53 | 49 | ||
| Current smoker | 16** | 11** | ||
| Alcohol use (≥7 drinks/week) | 7* | 4* | ||
| Family history of colorectal cancer in first-degree relative | 14** | 8** | ||
| Regular aspirin use (≥3 days/week) | 37 | 37 | ||
| Vigorous physical activity (≥2 hours/week) | 16 | 15 | ||
| Postmenopausal | 59 | 59 | ||
| Total energy intake, kcal | 1,338 (591) | 1,323 (594) | ||
| Red meat intake, servings/week | 4.08 (3.90) | 3.98 (4.09) | ||
| Fruit and vegetable intake, servings/week | 17.6 (12.9)** | 19.0 (14.1)** | ||
| Diabetes | 12 | 14 | ||
Abbreviation: SD, standard deviation.
* P < 0.05 for difference between cases and controls; **P < 0.01 for difference between cases and controls.
a Cases and controls were matched on age and follow-up time.
b Weight (kg)/height (m)2.