Table 1.
Descriptive characteristics of the women included into the study.
| N of children at end of follow-up | |||||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4+ | |
| N (%) | N (%) | N (%) | N (%) | N (%) | |
| Birth decade | |||||
| 1958–1969 | 83,330 (14) | 84,901 (15) | 257,854 (44) | 118,624 (20) | 40,253 (7) |
| 1970–1979 | 68,080 (16) | 72,029 (16) | 207,053 (47) | 73,159 (17) | 19,022 (4) |
| 1980–1989 | 207,108 (48) | 94,388 (22) | 104,152 (24) | 23,334 (5) | 4796 (1) |
| 1990–2000 | 497,478 (94) | 22,289 (4) | 6886 (1) | 660 (0) | 84 (0) |
| Age at first childbirth | |||||
| Nulliparous | 855,996 (100) | – | – | – | – |
| < 20 | – | 12,285 (15) | 26,453 (32) | 25,674 (31) | 19,117 (23) |
| 20–24 | – | 57,292 (16) | 164,962 (47) | 93,458 (27) | 32,064 (9) |
| 25–29 | – | 89,683 (22) | 237,398 (58) | 73,542 (18) | 11,033 (3) |
| 30–34 | – | 72,987 (33) | 123,938 (56) | 21,376 (10) | 1850 (1) |
| 35+ | – | 41,360 (62) | 23,194 (35) | 1727 (3) | 91 (0) |
The percentages reported in this table are row percentages.