Characteristics of case and control patients
Characteristics . | Case patients . | Control patients . | P . |
|---|---|---|---|
| No. | 743 | 743 | |
| Median age at pregnancy loss, y, (range) | 24 (19-31) | 24 (19-31) | |
| Median time elapsed since pregnancy loss, mo (range) | 9 (6-12) | 9 (6-12) | |
| Total no. of pregnancies | |||
| 1 | 212 | 212 | |
| 2 | 266 | 266 | |
| 3 | 265 | 265 | |
| Body mass index (%) | .58 | ||
| No more than 25 kg/m2 | 421 (56.6) | 438 (59) | |
| 26-30 kg/m2 | 263 (35.4) | 254 (34.2) | |
| More than 30 kg/m2 | 59 (8) | 51 (6.7) | |
| Cigarette smoker (%) | .69 | ||
| Never | 482 (65) | 466 (62.7) | |
| Current | 122 (16.3) | 130 (17.5) | |
| Former | 139 (18.7) | 147 (19.8) | |
| Oral contraceptive use (%) | .36 | ||
| Never | 483 (65) | 478 (64.3) | |
| Former | 260 (35) | 263 (35.4) | |
| Last menstrual cycle: yes | 81 | 86 | |
| Last menstrual cycle: no | 179 | 177 | |
| Current | 0 (0) | 2 (0.3) |
Characteristics . | Case patients . | Control patients . | P . |
|---|---|---|---|
| No. | 743 | 743 | |
| Median age at pregnancy loss, y, (range) | 24 (19-31) | 24 (19-31) | |
| Median time elapsed since pregnancy loss, mo (range) | 9 (6-12) | 9 (6-12) | |
| Total no. of pregnancies | |||
| 1 | 212 | 212 | |
| 2 | 266 | 266 | |
| 3 | 265 | 265 | |
| Body mass index (%) | .58 | ||
| No more than 25 kg/m2 | 421 (56.6) | 438 (59) | |
| 26-30 kg/m2 | 263 (35.4) | 254 (34.2) | |
| More than 30 kg/m2 | 59 (8) | 51 (6.7) | |
| Cigarette smoker (%) | .69 | ||
| Never | 482 (65) | 466 (62.7) | |
| Current | 122 (16.3) | 130 (17.5) | |
| Former | 139 (18.7) | 147 (19.8) | |
| Oral contraceptive use (%) | .36 | ||
| Never | 483 (65) | 478 (64.3) | |
| Former | 260 (35) | 263 (35.4) | |
| Last menstrual cycle: yes | 81 | 86 | |
| Last menstrual cycle: no | 179 | 177 | |
| Current | 0 (0) | 2 (0.3) |