Table 1.
Nurses’ Health Study (2000)
|
Nurses’ Health Study II (2001)
|
|||||
---|---|---|---|---|---|---|
Total cumulative average leisure-time physical activity, MET-h/week | ||||||
<3 | 9 to <18 | ≥27 | <3 | 9 to <18 | ≥27 | |
Subjects (n) | 4734 | 15378 | 9365 | 5124 | 19928 | 16567 |
Cumulative average activity, MET-h/week | 1.8 (0.8)1 | 13.2 (2.6) | 40.1 (12.5) | 1.8 (0.8) | 13.2 (2.6) | 42.3 (14.2) |
Recent activity, MET-h/week | 1.7 (2.1) | 13.5 (11.0) | 39.9 (25.1) | 2.1 (2.6) | 15.0 (12.5) | 40.0 (26.7) |
Baseline activity, MET-h/week | 1.9 (2.2) | 11.0 (9.9) | 33.4 (23.8) | 2.7 (2.6) | 15.6 (12.7) | 43.7 (27.4) |
Age, years | 66.3 (7.2) | 66.0 (7.1) | 66.0 (7.0) | 47.3 (4.6) | 46.5 (4.6) | 45.9 (4.7) |
Ever OC use, % | 47 | 49 | 50 | 85 | 85 | 85 |
Duration of OC use, months2 | 49.9 (45.9) | 51.0 (46.1) | 50.8 (46.7) | 67.5 (60.3) | 67.7 (59.2) | 70.2 (62.3) |
Postmenopausal, % | 97 | 98 | 98 | 17 | 15 | 15 |
Ever estrogen PMH use, %3 | 19 | 20 | 21 | 5 | 4 | 4 |
Duration of estrogen-only PMH use, months2 | 86.6 (78.4) | 93.8 (80.6) | 94.0 (80.7) | 2.1 (2.4) | 1.9 (1.7) | 2.0 (1.9) |
Ever estrogen-progestin PMH use, %3 | 32 | 37 | 39 | 51 | 56 | 56 |
Duration of estrogen-progestin PMH use, months2 | 61.4 (47.6) | 65.2 (48.2) | 67.0 (48.7) | 3.0 (2.4) | 2.7 (2.3) | 2.6 (2.3) |
History of tubal ligation, % | 20 | 21 | 21 | 26 | 24 | 22 |
History of hysterectomy, % | 23 | 23 | 21 | 9 | 9 | 9 |
Family history of breast or ovarian cancer, % | 19 | 20 | 20 | 13 | 14 | 14 |
Parous, % | 95 | 95 | 94 | 85 | 84 | 77 |
Number of children in parous women | 3.3 (1.6) | 3.2 (1.5) | 3.2 (1.5) | 2.3 (1.0) | 2.3 (0.9) | 2.3 (0.9) |
Caffeine, mg/day | 233.3 (225.9) | 208.8 (201.7) | 203.9 (194.4) | 234.5 (224.4) | 226.6 (209.4) | 226.9 (206.1) |
Lactose, g/day | 14.8 (12.6) | 16.4 (12.1) | 16.7 (12.1) | 15.8 (13.2) | 17.7 (13.1) | 18.5 (13.4) |
Body mass index, kg/m2 | 28.9 (6.7) | 26.7 (5.0) | 25.0 (4.3) | 29.5 (8.1) | 26.8 (6.1) | 25.1 (5.1) |
Mean (SD) for all such values
Duration among ever users
Among postmenopausal women