Table 1.
Baseline maternal characteristics by ever occurrence of an adverse pregnancy outcome, Sweden, 1973-2015. Values are number (percentage) of participants
| Characteristics | All women (n=2 195 266) | Preterm delivery (n=194 751) | Small for gestational age (n=314 605) | Pre-eclampsia (n=132 543) | Other hypertensive disorders of pregnancy (n=34 186) | Gestational diabetes (n=36 269 | |
|---|---|---|---|---|---|---|---|
| Age at first delivery (years): | |||||||
| <20 | 119 054 (5.4) | 16 329 (8.4) | 20 027 (6.4) | 6759 (5.1) | 1418 (4.2) | 1859 (5.1) | |
| 20-24 | 602 321 (27.4) | 58 301 (29.9) | 90 898 (28.9) | 36 879 (27.8) | 7966 (23.3) | 8797 (24.2) | |
| 25-29 | 790 440 (36.0) | 64 634 (33.2) | 109 077 (34.7) | 46 754 (35.3) | 11 662 (34.1) | 11 856 (32.7) | |
| 30-34 | 483 575 (22.0) | 38 379 (19.7) | 66 712 (21.2) | 28 479 (21.5) | 8519 (24.9) | 8595 (23.7) | |
| 35-39 | 166 339 (7.6) | 14 009 (7.2) | 23 307 (7.4) | 11 017 (8.3) | 3639 (10.6) | 4020 (11.1) | |
| ≥40 | 33 537 (1.5) | 3099 (1.6) | 4584 (1.5) | 2655 (2.0) | 982 (2.9) | 1142 (3.2) | |
| Period of first delivery: | |||||||
| 1973-79 | 528 175 (24.1) | 42 646 (21.9) | 92 125 (29.3) | 51 021 (38.5) | 1817 (5.3) | 6031 (16.6) | |
| 1980-89 | 444 535 (20.2) | 46 315 (23.8) | 65 695 (20.9) | 27 365 (20.6) | 6926 (20.3) | 5060 (14.0) | |
| 1990-99 | 445 510 (20.3) | 42 426 (21.8) | 58 355 (18.5) | 19 738 (14.9) | 8668 (25.4) | 7625 (20.0) | |
| 2000-09 | 460 901 (21.0) | 40 717 (20.9) | 57 180 (18.2) | 20 278 (15.3) | 9601 (28.1) | 10 380 (28.6) | |
| 2010-15 | 316 145 (14.4) | 22 647 (11.6) | 41 250 (13.1) | 14 141 (10.7) | 7174 (21.0) | 18 557 (20.8) | |
| Education (years): | |||||||
| ≤9 | 304 998 (13.9) | 30 401 (15.6) | 54 082 (17.2) | 21 391 (16.1) | 2938 (8.6) | 6472 (17.8) | |
| 10-12 | 971 712 (44.3) | 91 177 (46.8) | 144 549 (45.9) | 62 838 (47.4) | 15 085 (44.1) | 15 990 (44.1) | |
| >12 | 918 556 (41.8) | 73 173 (37.6) | 115 974 (36.9) | 48 314 (36.5) | 16 163 (47.3) | 13 807 (38.1) | |
| Employed | 1 894 648 (86.3) | 165 857 (85.2) | 264 748 (84.2) | 119 997 (90.5) | 31 121 (91.0) | 28 609 (78.9) | |
| Income fourth in year before delivery: | |||||||
| 1st (highest) | 548 873 (25.0) | 44 134 (22.7) | 67 748 (21.5) | 26 942 (20.3) | 12 531 (36.7) | 10 545 (29.1) | |
| 2nd | 547 162 (24.9) | 46 520 (23.9) | 75 756 (24.1) | 33 549 (25.3) | 8520 (24.9) | 8587 (23.7) | |
| 3rd | 551 468 (25.1) | 49 411 (25.4) | 84 955 (27.0) | 39 390 (29.7) | 6696 (19.6) | 7552 (20.8) | |
| 4th (lowest) | 547 763 (25.0) | 54 686 (28.1) | 86 146 (27.4) | 32 662 (24.6) | 6439 (18.8) | 9585 (26.4) | |
| Swedish born | 1 802 283 (82.1) | 160 656 (82.5) | 251 510 (79.9) | 114 766 (86.6) | 29 952 (87.6) | 25 929 (71.5) | |
| Body mass index: | |||||||
| <18.5 | 52 906 (2.4) | 5730 (2.9) | 10 816 (3.4) | 1509 (1.1) | 477 (1.4) | 542 (1.5) | |
| 18.5-24.9 | 844 958 (38.5) | 68 996 (35.4) | 112 544 (35.8) | 32 402 (24.5) | 13 081 (38.3) | 11 010 (30.4) | |
| 25.0-29.9 | 244 114 (11.1) | 20 876 (10.7) | 27 176 (8.6) | 15.127 (11.4) | 6.971 (20.4) | 6558 (18.1) | |
| ≥30.0 | 92 201 (4.2) | 9194 (4.7) | 10 474 (3.3) | 8962 (6.8) | 4442 (13.0) | 5116 (14.1) | |
| Unknown | 961 087 (43.8) | 89 955 (46.2) | 153 595 (48.8) | 74 543 (56.2) | 9215 (27.0) | 13 043 (36.0) | |
| Smoking (cigarettes/day): | |||||||
| 0 | 1 257 933 (57.1) | 106 397 (54.4) | 150 527 (47.7) | 60 699 (45.6) | 26 701 (77.7) | 23 423 (64.2) | |
| 1-9 | 154 498 (7.0) | 16 158 (8.3) | 29 052 (9.2) | 5971 (4.5) | 2390 (7.0) | 2614 (7.2) | |
| ≥10 | 69 352 (3.2) | 8498 (4.3) | 15 518 (4.9) | 2575 (1.9) | 994 (2.9) | 1243 (3.4) | |
| Unknown | 713 483 (32.7) | 63 698 (33.0) | 119 508 (38.2) | 63 298 (47.9) | 4101 (12.4) | 8989 (25.2) | |
| Medical history: | |||||||
| Hypertension | 2966 (0.1) | 718 (0.4) | 685 (0.2) | 884 (0.7) | 1212 (3.5) | 351 (1.0) | |
| Diabetes | 10 045 (0.5) | 3058 (1.6) | 745 (0.2) | 1907 (1.4) | 517 (1.5) | 6119 (16.8) | |
| Hyperlipidemia | 1826 (0.1) | 296 (0.2) | 211 (0.1) | 203 (0.2) | 114 (0.3) | 415 (1.1) | |