Table 1-1. Baseline characteristics of women by number of children.
| Number of children | 0 | 1 | 2 | ≧3 | Number of respondents (n) | P |
|---|---|---|---|---|---|---|
| No. of subjects | 2685 (8.3%) | 2839 (8.8%) | 15381 (47.8%) | 11284 (35.1%) | 32,189 | N.A |
| Age, y Median (interquartile range) | 64 (58-68) | 65 (60-70) | 65 (61-69) | 65 (60-69) | 32,189 | ＜0.0001 |
| Age at first child, y Median (interquartile range) | NA | 27 (24-30) | 25 (23-27) | 24 (22-26) | 27,702 | ＜0.0001 |
| Age at last child, y Median (interquartile range) | NA | 28 (25-31) | 28 (26-30) | 30 (29-33) | 27,402 | ＜0.0001 |
| Age at menopause, y Median (interquartile range) | 50 (46-52) | 50 (47-52) | 50 (48-53) | 50 (58-43) | 28,033 | ＜0.0001 |
| Percentage of menopausal women, % | 93.5 | 95.4 | 96.4 | 95.8 | 29,936 | ＜0.0001 |
| (2110/2257) | (2536/2658) | (13943/14465) | (10109/10556) | |||
| Educational level University/collee degree, % | 6.9 | 4.0 | 2.8 | 3.1 | 31,739 | ＜0.0001 |
| (167/2426) | (112/2822) | (422/15279) | (346/11212) | |||
| Smoking status | 8.3 | 5.6 | 3.8 | 3.8 | 31,141 | ＜0.0001 |
| Percentage of women who have smoked more than 100 cigarettes in their lifetime, % | (216/2587) | (155/2752) | (563/14897) | (413/10905) | ||
| Percentage of women who developed hypertensive disorders of pregnancy, % | NA＊ | 5.4 | 5.1 | 5.1 | 28,842 | ＜0.0001 |
| (0/2366) | (138/2560) | (698/13725) | (517/10191) |
＊Removed 12 women