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Table 4 Odds ratio of very preterm birth and extremely preterm birth in relation to NVP status

From: Nausea and vomiting during pregnancy associated with lower incidence of preterm births: the Japan Environment and Children’s Study (JECS)

  No NVP Mild NVP Moderate NVP Severe NVP
  OR 95% CI P value OR 95% CI P value OR 95% CI P value
Crude Odds ratio 1(reference) 0.72 0.57–0.91 0.007 0.61 0.47–0.80 < 0.001 0.44 0.30–0.66 < 0.001
Adjusted Odds ratioa 1(reference) 0.74 0.58–0.94 0.01 0.62 0.47–0.82 0.001 0.44 0.29–0.67 < 0.001
  1. a Adjusted for maternal age, BMI, smoking, education and parity