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Table 3 Odds ratio of 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) 0.88 0.81–0.95 0.002 0.84 0.76–0.91 < 0.001 0.83 0.74–0.94 0.002
Adjusted Odds ratioa 1(reference) 0.87 0.80–0.95 0.002 0.85 0.78–0.93 0.001 0.84 0.74–0.95 0.004
  1. a Adjusted for maternal age, BMI, smoking, education and parity