Table 1.
Basic characteristics
| Women redeeming a trimethoprim prescription in the first trimester (n = 265) | Women not redeeming a trimethoprim prescription in the first trimester (n = 931 239) | P value | |
|---|---|---|---|
| No. of miscarriages | 31 | 77 522 | <0·001 |
| Age (years) | <0·001 | ||
| < 20 | 16 (6·0%) | 30 810 (3·3%) | |
| 20–24 | 53 (20·0%) | 120 725 (13·0%) | |
| 25–29 | 69 (26·0%) | 296 397 (32·0%) | |
| 30–34 | 70 (26·4%) | 309 059 (33·2%) | |
| > 35 | 57 (21·5%) | 174 248 (18·7%) | |
| Educational level | <0·001 | ||
| Low | 133 (50·6%) | 343 839 (37·8%) | |
| Medium | 78 (29·7%) | 270 109 (29·7%) | |
| High | 45 (17·1%) | 264 231 (29·1%) | |
| No information | 7 (2·6%) | 31 174 (3·4%) | |
| Income | 0·007 | ||
| Lowest quartile | 74 (28·0%) | 232 727 (25·0%) | |
| Low quartile | 89 (33·6%) | 232 666 (25·0%) | |
| Medium quartile | 57 (21·5%) | 232 802 (25·0%) | |
| High quartile | 45 (17·0%) | 233 034 (25·0%) | |
| No. of previous miscarriages | 0·12 | ||
| 0 | 227 (85·7%) | 770 759 (82·8%) | |
| 1 | 26 (9·8%) | 129 395 (13·9%) | |
| 2 | 8 (3·0%) | 24 320 (2·6%) | |
| ⩾ 3 | 4 (1·5%) | 6765 (0·7%) |