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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)

From: Severe nausea and vomiting in pregnancy: psychiatric and cognitive problems and brain structure in children

  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)