Table 2 Characteristics of the Danish study population born between 1978 and 2012 at birth according to maternal hyperemesis gravidarum status (N = 2,092,897)
| Â | Maternal hyperemesis gravidarum status | |
|---|---|---|
Yes (N = 21,282) | No (N = 2,071,615) | |
Characteristics | N (%) | N (%) |
Sex | ||
 Boys | 9702 (45.6) | 1,064,828 (51.4) |
 Girls | 11,580 (54.4) | 1,006,787 (48.6) |
Preterm | ||
 No | 19,573 (92.0) | 1,899,027 (91.7) |
 Yes | 1088 (5.1) | 95,375 (4.6) |
 Missing | 621 (2.9) | 77,213 (3.7) |
Low birth weight | ||
 No | 20,146 (94.6) | 1,961,425 (94.7) |
 Yes | 840 (4.0) | 80,443 (3.9) |
 Missing | 296 (1.4) | 29,747 (1.4) |
Parity | ||
 1 | 9488 (44.6) | 922,209 (44.5) |
 2 | 7916 (37.2) | 770,725 (37.2) |
 ≥ 3 | 3878 (18.2) | 378,681 (18.3) |
Maternal age (years) | ||
 ≤ 25 | 7112 (33.4) | 569,002 (27.5) |
 26–30 | 7619 (35.8) | 785,543 (37.9) |
 31–35 | 4868 (22.9) | 526,372 (25.4) |
 > 36 | 1683 (7.9) | 190,698 (9.2) |
Paternal age (years) | ||
 ≤ 25 | 3608 (17.0) | 293,050 (14.1) |
 26–30 | 6683 (31.4) | 659,191 (31.8) |
 31–35 | 5993 (28.2) | 616,331 (29.8) |
 > 36 | 4393 (20.6) | 413,205 (20.0) |
 Missing | 605 (2.8) | 89,838 (4.3) |
Maternal education level | ||
 0–9 | 7026 (33.0) | 577,435 (27.9) |
 10–14 | 9257 (43.5) | 905,428 (43.7) |
 ≥ 15 | 4454 (20.9) | 555,847 (26.8) |
 Missing | 545 (2.6) | 32,905 (1.6) |
Maternal psychiatric disorders | ||
 No | 19,042 (89.5) | 1,964,722 (94.8) |
 Yes | 2240 (10.5) | 106,893 (5.2) |
Paternal psychiatric disorders | ||
 No | 19,991 (93.9) | 1,981,118 (95.6) |
 Yes | 1291 (6.1) | 90,497 (4.4) |
Maternal original | ||
 Born in Denmark | 16,103 (75.7) | 1,853,108 (89.5) |
 Not born in Denmark | 5151 (24.2) | 213,826 (10.3) |
 Missing | 28 (0.1) | 4681 (0.2) |
Maternal cohabitation status | ||
 Yes | 12,590 (59.2) | 1,158,257 (55.9) |
 No | 8688 (40.8) | 911,630 (44.0) |
 Missing | 4 (0.0) | 1728 (0.1) |