Table 1 Prevalence of hyperemesis gravidarum (HG) with 95% confidence intervals (95% CI) according to background characteristics (N = 71,468)
n (%) | HG (%) (95% CI) | |
|---|---|---|
Maternal age | ||
< 20 years | 816 (1.1) | 2.8 (2.7-2.9) |
20-24 years | 7674 (10.7) | 1.9 (1.8-2.0) |
25-29 years | 25267 (35.3) | 1.1 (1.1-1.2) |
30-34 years | 27064 (37.9) | 0.9 (0.9-1.0) |
≥ 35 years | 10647 (14.9) | 1.0 (0.9-1.0) |
Parity | ||
Primipara | 33408 (46.8) | 1.1 (1.0-1.1) |
Multipara | 38060 (53.2) | 1.2 (1.1-1.3) |
Body mass index | ||
< 18.5 (kg/m2) | 1325 (1.9) | 2.0 (1.9-2.1) |
18.5-24.9 (kg/m2) | 47390 (66.3) | 1.0 (0.9-1.1) |
25.0-29.9(kg/m2) | 15727 (22.0) | 1.4 (1.3-1.5) |
≥ 30.0 (kg/m2) | 7026 (9.8) | 1.5 (1.4-1.6) |
Education | ||
< 12 years | 14168 (19.8) | 1.6 (1.5-1.7) |
12 years | 10438 (14.6) | 1.4 (1.3-1.4) |
13-16 years | 29569 (41.4) | 1.1 (1.0-1.1) |
≥ 17 years | 17293 (24.2) | 0.8 (0.7-0.9) |
Smoking habit | ||
Non-smokers | 65362 (91.5) | 1.2 (1.1-1.3) |
Smokers | 6106 (8.5) | 0.6 (0.5-0.7) |
Weight gain during pregnancy | ||
< 0 kg | 565 (0.8) | 5.9 (5.7-6.0) |
0 - 6.9 kg | 3708 (5.2) | 2.3 (2.2-2.5) |
7.0 - 14.9 kg | 26360 (36.9) | 1.1 (1.1-1.2) |
15.0 - 19.9 kg | 15239 (21.3) | 0.7 (0.7-0.8) |
≥ 20 kg | 8126 (11.4) | 1.1 (1.0-1.1) |
Missing | 17470 (24.4) | 1.1 (1.0-1.2) |