Table 1.
Main maternal characteristics (n=86 885)
| Characteristics | Total | The number of chronic conditions | ||
| 0 (n=51 964) | 1 (n=29 459) | ≥2 (n=5462) | ||
| Maternal age (years) | ||||
| ≤24 | 8599 (9.9) | 4451 (8.6) | 3342 (11.3) | 806 (14.8) |
| 25–29 | 23 873 (27.5) | 14 205 (27.3) | 8232 (27.9) | 1436 (26.3) |
| 30–34 | 30 686 (35.3) | 18 776 (36.1) | 10 142 (34.4) | 1768 (32.4) |
| 35–39 | 19 703 (22.7) | 12 121 (23.3) | 6381 (21.7) | 1201 (22.0) |
| ≥40 | 4018 (4.6) | 2409 (4.6) | 1359 (4.6) | 250 (4.6) |
| Missing | 6 (0.01) | 2 (0.00) | 3 (0.01) | 1 (0.02) |
| Body mass index (kg/m2) | 20.5 (13.2–52.8) | 20.7 (18.5–24.9) | 20.0 (13.2–48.8) | 19.5 (13.3–52.8) |
| Parity | ||||
| 0 | 35 973 (41.4) | 21 952 (42.2) | 11 972 (40.6) | 2049 (37.5) |
| 1 | 31 810 (36.6) | 19 030 (36.6) | 10 750 (36.5) | 2030 (37.2) |
| ≥2 | 17 040 (19.6) | 9691 (18.7) | 6059 (20.6) | 1290 (23.6) |
| Missing | 2062 (2.4) | 1291 (2.5) | 678 (2.3) | 93 (1.7) |
| Smoking during pregnancy | ||||
| No | 49 414 (56.9) | 31 028 (59.7) | 15 937 (54.1) | 2449 (44.8) |
| Quit before pregnancy | 20 152 (23.2) | 12 094 (23.3) | 6777 (23.0) | 1281 (23.5) |
| Quit after pregnancy | 12 042 (13.9) | 6320 (12.2) | 4613 (15.7) | 1109 (20.3) |
| Yes | 3859 (4.4) | 1757 (3.4) | 1604 (5.4) | 498 (9.1) |
| Missing | 1418 (1.6) | 765 (1.5) | 528 (1.8) | 125 (2.3) |
| Drinking during pregnancy | ||||
| No | 28 652 (33.0) | 16 928 (32.6) | 9957 (33.8) | 1767 (32.4) |
| Quit before pregnancy | 14 108 (16.2) | 8321 (16.0) | 4832 (16.4) | 955 (17.5) |
| Quit after pregnancy | 40 354 (46.5) | 24 554 (47.3) | 13 378 (45.4) | 2422 (44.3) |
| Yes | 2370 (2.7) | 1386 (2.7) | 771 (2.6) | 213 (3.9) |
| Missing | 1401 (1.6) | 775 (1.5) | 521 (1.8) | 105 (1.9) |
Values are presented as n (%) or median (range: min–max).