Table 3.
Characteristics of the study cohort: Reproductive factors
| Variable | n = 89434(%) |
|---|---|
| Age at menarche |
|
| 9-10 |
2675 (2.99) |
| 11-13 |
59433 (66.46) |
| 14-16 |
26231 (29.33) |
| 17-18 |
1095 (1.22) |
| Still have periods |
|
| Yes |
39281 (43.92) |
| No |
50153 (56.08) |
| Menstrual status |
|
| Pre-menopause |
49201 (55.01) |
| Post-menopause |
40233 (44.99) |
| Menstruation length (years) (mean±SD) |
32.10(±5.85) |
| Number of live births |
|
| Nulliparous |
13173 (14.73) |
| 1-2 |
32781 (36.65) |
| 3-4 |
33952 (37.96) |
| > = 5 |
9528 (10.66) |
| Regular periods |
|
| Yes |
70635 (78.98) |
| No |
18799 (21.02) |
| Had a hysterectomy |
|
| Yes |
27584 (30.84) |
| No |
27584 (69.16) |
| Had a bi-lateral oophorectomy |
|
| Yes |
9567 (10.70) |
| No |
79867 (89.30) |
| Ever pregnant |
|
| Yes |
78870 (88.19) |
| No |
10564 (11.81) |
| Number of pregnancies |
|
| 0 |
13173 (14.73) |
| 1-2 |
23050 (25.77) |
| 3-4 |
34721 (38.82) |
| 5-10 |
17966 (20.09) |
| 11-17 |
524 (0.59) |
| Pregnancies lasted < 4 months |
|
| 0 |
60228 (67.35) |
| 1-2 |
25563 (28.58) |
| 3-4 |
2998 (3.35) |
| 5-10 |
645 (0.72) |
| Age at first child birth |
|
| N/A |
13173 (14.73) |
| 14-19 |
8345 (9.33) |
| 20-25 |
42234 (47.22) |
| 26-30 |
18756 (20.97) |
| 31-34 |
4683 (5.24) |
| 35-39 |
2011 (2.25) |
| 40-49 | 232 (0.26) |