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Table 6 Mean difference in birth weight, length, and head circumference for the nausea only (NP) and nausea and vomiting (NVP) groups compared to the symptom-free (SF) groupa

From: Pregnancy complications and birth outcomes among women experiencing nausea only or nausea and vomiting during pregnancy in the Norwegian Mother and Child Cohort Study

  Crude   Adjustedb  
Outcome Group Mean (95 % CI) P value Mean (95 % CI) P value
Birth weight (g), n = 51 106 SF reference <0.001 reference <0.001
  NP 76.9 (66.0–87.9)   38.4 (29.2–47.6)
  NVP 43.9 (32.6–55.4)   20.9 (11.4–30.5)
Body length (cm), n = 49 180 SF reference <0.001 reference <0.001
  NP 0.20 (0.16–0.25)   0.11 (0.07–0.15)  
  NVP 0.08 (0.03–0.12)   0.07 (0.03–0.11)  
Head circumference (cm), SF reference <0.001 reference <0.001
n = 50 319 NP 0.12 (0.09–0.15)   0.06 (0.04–0.09)  
  NVP 0.05 (0.01–0.08)   0.03 (0.00–0.06)  
  1. aLinear regression analysis
  2. bAdjusted for age, body mass index, smoking during pregnancy, parity, education, gender, gestational length, and energy intake