生育次数 | ≤20岁 | 21~25岁 | 26~30岁 | 31~35岁 | 36~40岁 | 大于40岁 |
P1 | 9 (0.75%) | 56 (4.6%) | 248 (20.7%) | 192 (16%) | 93 (7.7%) | 55 (4.5%) |
P2 | 0 | 8 (0.6%) | 33 (2.75%) | 38 (2.92%) | 45 (3.75%) | 19 (1.58%) |
P3 | 0 | 0 | 1 (0.083%) | 4 (0.33%) | 5 (0.41%) | 4 (0.33) |