Table 1.
Characteristics of women who had a second pregnancy after miscarriage, by interpregnancy intervals. Values are numbers (percentages) of women unless stated otherwise
| Characteristics | Interpregnancy intervals (months) | P value | ||||
|---|---|---|---|---|---|---|
| <6 (n=12 744) | 6-12 (n=7791) | 12-18 (n=2958) | 18-24 (n=1995) | >24 (n=5449) | ||
| Mean (SD) age during pregnancy: | ||||||
| First pregnancy | 26.0 (5.4) | 25.9 (5.8) | 25.6 (6.0) | 25.3(6.2) | 23.9 (5.9) | <0.01 |
| Second pregnancy | 26.9 (5.4) | 27.3 (5.8) | 27.4 (6.0) | 27.6 (6.2) | 28.7 (5.9) | <0.01 |
| Carstairs category 1-4: | ||||||
| First pregnancy | 4449 (34.9) | 2621 (33.6) | 916 (31.0) | 623 (31.2) | 1547 (28.4) | <0.01 |
| Second pregnancy | 4724 (37.1) | 2773 (35.6) | 1001 (33.8) | 677 (33.9) | 1763 (32.4) | <0.01 |
| Smoking status: | ||||||
| Ever smoked | 1261 (9.9) | 835 (10.7) | 398 (13.5) | 290 (14.5) | 963 (17.7) | <0.01 |
| Never smoked | 4230 (33.2) | 2308 (29.6) | 845 (28.6) | 575 (28.8) | 1543 (28.3) | |
| Not known | 7253 (56.9) | 4648 (59.7) | 1715 (58.0) | 1130 (56.6) | 2943 (54.0) | |