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Table 1 Characteristics of the pregnant women in the Cambridge Baby Growth Study who returned their questionnaires categorised according to whether or not they experienced nausea or vomiting in pregnancy

From: Vomiting in pregnancy is associated with a higher risk of low birth weight: a cohort study

Characteristic No Nausea or Vomiting Nausea alone Vomiting
n 286 467 465
Age (years) 34.2 (33.7, 34.6) 33.6 (33.4, 33.9) 33.1*** (32.7, 33.4)
Height (m) 166.1 (165.3, 166.8) 165.9 (165.5, 166.3) 165.7 (165.1, 166.4)
Pre-pregnancy weight (kg) 65.0 (63.6, 66.4) 66.1 (65.3, 66.9) 67.1* (66.0, 68.3)
Pre-pregnancy BMI (kg/m2) 23.6 (23.1, 24.1) 24.0 (23.7, 24.3) 24.5* (24.0, 24.9)
Weight gain during pregnancy (kg) 7.9 (7.1, 8.7) 8.2 (7.7, 8.6) 8.4 (7.7, 9.1)
Smoked during pregnancy (%) 4.2 1.9 4.6
Developed gestational diabetes (%) 10.6 9.6 9.6
Developed gestational hypertension (%) 6.9 4.2 7.2
  1. *P < 0.05, **P < 0.01, ***P < 0.001 compared with the no nausea or vomiting group. Data are mean (95% CI). None of these women were treated with anti-emetics during pregnancy. Nausea alone refers to those women who experienced nausea in pregnancy but not vomiting. Vomiting refers to those women who experienced vomiting during pregnancy, independently of whether or not they also experienced nausea