Table 1.
Characteristics of study population
| Characteristics | Non- asthmatic mothers (N=877,936) |
Asthmatic mothers | ||||
|---|---|---|---|---|---|---|
| All asthmatic mothers (N=83,266) |
No exacerbations (N=69,746) |
With exacerbations before pregnancy only (N=7,573) |
With exacerbations during pregnancy (N=2,103) |
With exacerbations after delivery (N=3,844) |
||
| Maternal age at delivery (years) | ||||||
| 25 | 111,758 (12.7) | 13,050 (15.7) | 11,076 (15.9) | 1,136 (15.0) | 305 (14.5) | 533 (13.9) |
| 25–34 | 614,502 (70.0) | 56,050 (67.3) | 47,012 (67.4) | 5,094 (67.3) | 1,302 (61.9) | 2,642 (68.7) |
| ≥>35 | 151,676 (17.3) | 14,166 (17.0) | 11,658 (16.7) | 1,343 (17.7) | 496 (23.6) | 669 (17.4) |
| Parity | ||||||
| 1 | 380,386 (43.3) | 36,530 (43.9) | 30,831 (44.2) | 3,392 (44.8) | 819 (38.9) | 1,488 (38.7) |
| ≥2 | 493,723 (56.2) | 46,296 (55.6) | 38,555 (55.3) | 4,136 (54.6) | 1,270 (60.4) | 2,335 (60.7) |
| Unknown | 3,827 (0.4) | 440 (0.5) | 360 (0.5) | 45 (0.6) | 14 (0.7) | 21 (0.6) |
| Maternal smoking during pregnancy | ||||||
| Yes | 146,268 (16.7) | 17,540 (21.1) | 14,573 (20.9) | 1,607 (21.2) | 506 (24.1) | 854 (22.2) |
| No | 705,865 (80.4) | 63,497 (76.3) | 53,359 (76.5) | 5,755 (76.0) | 1,522 (72.4) | 2,861 (74.4) |
| Unknown | 25,803 (2.9) | 2,229 (2.7) | 1,814 (2.6) | 211 (2.8) | 75 (3.6) | 129 (3.4) |
| Maternal mental disorder before pregnancy | ||||||
| No mental disorder | 731,199 (83.3) | 59,216 (71.1) | 50,287 (72.1) | 4,975 (65.7) | 1,339 (63.7) | 2,615 (68.0) |
| ADHD | 1,108 (0.1) | 367 (0.4) | 309 (0.4) | 28 (0.4) | 10 (0.5) | 20 (0.5) |
| Other mental disorders | 145,629 (16.6) | 23,683 (28.4) | 19,150 (27.5) | 2,570 (33.9) | 754 (35.9) | 1,209 (31.5) |
| Maternal cohabiting status | ||||||
| Married or cohabiting | 773,997 (88.2) | 71,590 (86.0) | 60,045 (86.1) | 6,465 (85.4) | 1,744 (82.9) | 3,336 (86.8) |
| Single, divorced, or widow | 95,348 (10.9) | 11,446 (13.7) | 9,498 (13.6) | 1,097 (14.5) | 351 (16.7) | 500 (13.0) |
| Unknown | 8,591 (1.0) | 230 (0.3) | 203 (0.3) | 11 (0.2) | 8 (0.4) | 8 (0.2) |
| Place of residence at delivery | ||||||
| Capital or capital suburb | 258,780 (29.5) | 22,844 (27.4) | 19,386 (27.8) | 1,864 (24.6) | 664 (31.6) | 930 (24.2) |
| Provincial city or town | 345,904 (39.4) | 33,107 (39.8) | 27,575 (39.5) | 3,129 (41.3) | 791 (37.6) | 1,612 (41.9) |
| Rural areas | 273,252 (31.1) | 27,315 (32.8) | 22,785 (32.7) | 2,580 (34.1) | 648 (30.8) | 1,302 (33.9) |
| Low social class at delivery | ||||||
| Yes | 85,382 (9.7) | 10,602 (12.7) | 8,687 (12.5) | 1,042 (13.8) | 353 (16.8) | 520 (13.5) |
| No | 764,450 (87.1) | 71,626 (86.0) | 60,243 (86.4) | 6,434 (85.0) | 1,695 (80.6) | 3,254 (84.7) |
| Missing | 28,104 (3.2) | 1,038 (1.3) | 816 (1.2) | 97 (1.3) | 55 (2.6) | 70 (1.8) |
| Large family size at delivery | ||||||
| Yes | 40,573 (4.6) | 4,384 (5.3) | 3,493 (5.0) | 475 (6.3) | 175 (8.3) | 241 (6.3) |
| No | 837,363 (95.4) | 78,882 (94.7) | 66,253 (95.0) | 7,098 (93.7) | 1,928 (91.7) | 3,603 (93.7) |
| Calendar year of birth | ||||||
| 1997–2000 | 238,719 (27.2) | 14,008 (16.8) | 11,381 (16.3) | 1,432 (18.9) | 437 (20.8) | 758 (19.7) |
| 2001–2005 | 276,070 (31.4) | 23,709 (28.5) | 19,584 (28.1) | 2,279 (30.1) | 634 (30.2) | 1,212 (31.5) |
| 2006–2012 | 363,147 (41.4) | 45,549 (54.7) | 38,781 (55.6) | 3,862 (51.0) | 1,032 (49.1) | 1,874 (48.8) |
| Paternal asthma before delivery | 59,890 (6.8) | 7,274 (8.7) | 6,102 (8.8) | 647 (8.5) | 202 (9.6) | 323 (8.4) |
| Sex of the child | ||||||
| Boys | 427,372 (48.7) | 40,560 (48.7) | 33,972 (48.7) | 3,733 (49.3) | 1,021 (48.5) | 1,834 (47.7) |
| Girls | 450,564 (51.3) | 42,706 (51.3) | 35,774 (51.3) | 3,840 (50.7) | 1,082 (51.5) | 2,010 (52.3) |
| Preterm birth (gestational age <37 weeks) | ||||||
| Yes | 41,472 (4.7) | 4,725 (5.7) | 3,827 (5.5) | 481 (6.4) | 173 (8.2) | 244 (6.3) |
| No | 836,464 (95.3) | 78,541 (94.3) | 65,919 (94.5) | 7,092 (93.6) | 1,930 (91.8) | 3,600 (93.7) |
| Low birth weight (<2500 g) | ||||||
| Yes | 30,790 (3.5) | 3,462 (4.2) | 2,808 (4.0) | 355 (4.7) | 120 (5.7) | 179 (4.7) |
| No | 847,146 (96.5) | 79,804 (95.8) | 66,938 (96.0) | 7,218 (95.3) | 1,983 (94.3) | 3,665 (95.3) |
Figures are numbers (%).