TABLE 1.
Baseline demographic characteristics by amount of alcohol intake in 1989 (n = 17,929 women): Nurses’ Health Study II, 1989–20091
| Baseline alcohol intake category |
|||
| Lowest | Middle | Highest | |
| Range of intake, g/d | 0 | 2–4.9 | ≥10 |
| Women, n | 5937 | 2345 | 1705 |
| Maternal age, y | 30.0 (28.0, 33.0) | 30.0 (28.0, 33.0) | 30.0 (28.0, 33.0) |
| Prepregnancy BMI, kg/m2 | 22.1 (20.4, 25.0) | 21.6 (20.1, 23.7) | 21.8 (20.3, 23.8) |
| Physical activity, MET-h/wk | 12.3 (4.5, 28.8) | 19.8 (8.2, 40.3) | 20.9 (9.0, 43.0) |
| Smoking status | |||
| Never smoker | 4803 (80.9) | 1563 (66.7) | 832 (48.8) |
| Former smoker | 783 (13.2) | 548 (23.4) | 518 (30.4) |
| Current smoker | 342 (5.8) | 230 (9.8) | 354 (20.8) |
| White | 5360 (90.3) | 2245 (95.7) | 1640 (96.2) |
| Married | 5048 (85.0) | 1678 (71.6) | 1050 (61.6) |
| Oral contraceptive use | |||
| Never | 1304 (22.0) | 354 (15.1) | 191 (11.2) |
| Past | 3618 (60.9) | 1325 (56.5) | 934 (54.8) |
| Current | 1007 (17.0) | 665 (28.4) | 579 (34.0) |
| History of infertility | 880 (14.8) | 249 (10.6) | 192 (11.3) |
| Parity | |||
| Nulliparous | 2050 (34.5) | 1330 (56.7) | 1151 (67.5) |
| 1 | 2149 (36.2) | 577 (24.6) | 323 (18.9) |
| 2 | 1245 (21.0) | 334 (14.2) | 190 (6.1) |
| ≥3 | 493 (8.3) | 104 (4.4) | 41 (2.4) |
| Multivitamin use | 2498 (42.1) | 1158 (49.4) | 829 (48.6) |
| Alcohol intake, g/d | 0.0 (0.0, 0.0) | 2.7 (2.6, 3.5) | 12.2 (11.0, 15.9) |
| Caffeine intake,2 mg/d | 77.0 (24.0, 184) | 152.0 (63.0, 351) | 185.0 (92.0, 378) |
1
Values are medians (25th percentiles, 75th percentiles) or n (%). MET-h, metabolic equivalent task hours.
2
Assessed in 1991.