Table 1 Baseline characteristics of women in the HUNT2 Survey, Norway, 1995–97 (n = 21,889)
Variablesa | Ever lactated | Never lactated | Nulliparous |
|---|---|---|---|
(n = 19,350) | (n = 657) | (n = 1,882) | |
Mean age, years (SD) | 52.1 (14.1) | 52.5 (12.5) | 55.9 (16.8) |
Age at delivery of first child, yrs | 23.4 (4.1) | 24.4 (5.2) | - |
Lifetime lactation duration, months, median (IQR)b | 14 (14) | - | - |
Systolic blood pressure, mmHg, mean (SD) | 135.9 (23.0) | 139.5 (22.4) | 141.6(25.1) |
Diastolic blood pressure, mmHg, mean (SD) | 79.5 (11.9) | 82.1 (11.9) | 81.1 (12.4) |
Cholesterol, mmol/L, mean (SD) | 6.0 (1.3) | 6.2 (1.1) | 6.2 (1.4) |
Triglycerides, mmol/l, mean (SD) | 1.6 (0.99) | 1.7 (0.98) | 1.6 (1.0) |
Body mass index, kg/m2, mean (SD) | 26.4 (4.5) | 27.6 (4.9) | 26.6 (5.0) |
Waist –hip ratio, mean (SD) | 0.80 (0.06) | 0.81 (0.06) | 0.80 (0.06) |
Parity, | |||
Para 1, n (%) | 1,793 (9.3) | 175 (26.6) | - |
Para 2, n (%) | 7,305 (37.4) | 260 (39.6) | - |
Para 3, n (%) | 6,187 (32.0) | 151 (23.0) | - |
Para 4 or greater, n (%) | 4,065 (21.0) | 71 (10.8) | - |
College/university education, n (%)c | 3,659 (18.9) | 86 (13.1) | 409 (21.7) |
Never smokers, n (%) | 9,345 (48.6) | 248 (37.8) | 1,085 (58.6) |
High physical activityd,e, n (%) | 3,468 (17.9) | 86 (13.1) | 311 (16.5) |
Unmarried/divorced, n (%) | 3,081 (15.9) | 133 (20.2) | 972 (51.8) |
Cardiovascular diseasef, n (%) | 1,070 (5.5) | 38 (5.8) | 142 (7.6) |
Hypertensiong, n (%) | 7.935 (41.0) | 326 (49.6) | 953 (50.6) |
Elevated triglyceridesf, n (%) | 6,286 (32.5) | 257 (39.2) | 612 (32.4) |
Diabetes, n (%) | 523 (2.7) | 31 (4.7) | 78 (4.1) |
Obesity, n (%) | 3,655 (18.9) | 186 (28.3) | 406 (21.6) |
Abdominal obesityg, n (%) | 5,369 (27.8) | 257 (39.2) | 512 (27.3) |