Skip to main content

Advertisement

Table 1 Demographic characteristics of all mothers, mothers of cases and mothers of controls, and birth outcomes for all offspring, for cases and controls

From: Hyperemesis gravidarum and risk of cancer in offspring, a Scandinavian registry-based nested case–control study

  Cases (%) Controls (%) Total
Maternal country of birth
 Europe, USA, Canada 14.102 (95.3) 139.949 (94.7) 154,051
 Middle-East* 262 (1.8) 2.732 (1.8) 2.994
 Africa excluding North-Africa 77 (0.5) 823 (0.6) 900
 Asia** 155 (1.0) 1.897 (1.3) 2.052
 Central and South-America 105 (0.7) 1.085 (0.7) 1.190
 Other countries and missing 104 (0.7) 1.223 (0.8) 1.327
Maternal age, in years
 <20 601 (4.1) 6.227 (4.2) 6.828
 20–24 3.423 (23.1) 35.446 (24.0) 38.869
 25–29 5.385 (36.4) 53.690 (36.3) 59.075
 30–34 3.716 (25.1) 36.561 (24.8) 40.277
 >34 1.680 (11.3) 15.785 (10.7) 17.465
Smoking***
 Nonsmoker 2.042 (13.8) 21.011 (14.2) 23.053
 Smoker 1.264 (8.5) 12.418 (8.4) 13.682
 Missing 11.499 (77.7) 114.280 (77.4) 125.779
Hyperemesis status
 HG + 97 (0.7) 818 (0.6) 915
 HG - 14.708 (99.3) 146.891 (99.4) 161.599
Birth weight (gr)
 <1500 97 (0.7) 1.021 (0.7) 1.118
 1500–2499 549 (3.7) 5.602 (3.8) 6.151
 2500–3499 6.046 (40.8) 63.972 (43.3) 70.018
 >3500 8.067 (54.5) 76.771 (52.0) 84.838
 Missing 46 (0.3) 343 (0.2) 389
Placental weight (gr)****
 <500 411 (2.8) 4.177 (2.8) 4.588
 500–999 2.492 (16.8) 24.872 (16.8) 27.364
 ≥1000 112 (0.8) 929 (0.8) 1.041
 Missing 11.790 (79.6) 117.731 (79.7) 129.521
Apgar score after 1 min*****
 < 7 659 (4.5) 5.597 (3.8) 6.256
 ≥ 7 11.760 (79.4) 117.986 (79.9) 129.746
 Missing 2.386 (16.1) 24.126 (16.3) 26.512
Apgar score after 5 min*****
 < 7 161 (1.1) 1.400 (0.9) 1.561
 ≥ 7 12.558 (84.8) 125.480 (85.0) 138.038
 Missing 2.086 (14.1) 20.829 (14.1) 22.915
Total 14.805 147.709 162.514
  1. *Middle-East includes Turkey, Lebanon, Syria, Palestine, Iraq, Morocco, Algeria, Tunisia, Libya, Egypt, Iran
  2. **Asia includes Pakistan, India, Sri-Lanka, Vietnam, Thailand, Philippines, China, South-Korea, Japan
  3. ***Available from 1991 in Denmark, 1999 in Norway and 1982 in Sweden
  4. ****Available from 1997 in Denmark, 1999 in Norway and in for the years 1982–1999 in Sweden
  5. *****Available from 1991 in Denmark, 1999 in Norway and 1982 in Sweden
  6. Numbers in parentheses indicate percentage distributions within the categories of each variable among all offspring, among cases and among controls