Table 1.
Characteristics of women with and without polycystic ovary syndrome (PCOS) giving birth to singleton pregnancies (1 195 123 total births) in Sweden, 1995 to 2007
| Maternal characteristics | No of births (rate %) | P value* | |
|---|---|---|---|
| Women with PCOS (n=3787) | Women without PCOS (n=1 191 336) | ||
| Age (years): | |||
| 13-24 | 339 (8.95) | 188 795 (15.85) | <0.001 |
| 25-29† | 1180 (31.16) | 390 088 (32.74) | |
| 30-34 | 1515 (40.01) | 403 303 (33.85) | |
| ≥35 | 753 (19.88) | 209 125 (17.55) | |
| Data missing | 0 | 25 | |
| Body mass index: | |||
| ≤19.9 | 148 (4.53) | 99 360 (9.91) | <0.001 |
| 20.0-24.9† | 1140 (34.88) | 554 456 (55.33) | |
| 25.0-29.9 | 932 (28.52) | 245 606 (24.51) | |
| ≥30.0 | 1048 (32.07) | 102 734 (10.25) | |
| Data missing | 519 | 189 180 | |
| Parity: | |||
| 0 | 1990 (52.55) | 520 106 (43.66) | <0.001 |
| ≥1† | 1797 (47.45) | 671 206 (56.34) | |
| Data missing | 0 | 24 | |
| Education level (years): | |||
| ≤11 | 2139 (56.69) | 663 449 (56.11) | 0.47 |
| ≥12† | 1634 (43.31) | 518 974 (43.89) | |
| Data missing | 14 | 8913 | |
| Cigarette consumption (daily): | |||
| None† | 3192 (90.42) | 988 375 (88.60) | 0.003 |
| 1-9 | 232 (6.57) | 87 909 (7.88) | |
| ≥10 | 106 (3.00) | 39 291 (3.52) | |
| Data missing | 257 | 75 761 | |
| Assisted reproductive technology: | |||
| Yes | 515 (13.60) | 18 020 (1.51) | <0.001 |
| No | 3272 (86.40) | 1 173 316 (98.49) | |
| Essential hypertension: | |||
| Yes | 26 (0.69) | 3345 (0.28) | <0.001 |
| No | 3761 (99.31) | 1 187 991 (99.72) | |
| Diabetes mellitus: | |||
| Yes | 76 (2.01) | 4596 (0.38) | <0.001 |
| No | 3711 (97.99) | 1 186 767 (99.62) | |
*Wald test of overall effect (test of general heterogeneity).
†Reference group.