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Table 2 Distribution of gestational week according to NVP status

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

  Total No NVP Mild NVP Moderate NVP Severe NVP P value
n = 96,056 n = 16,596 n = 41,198 n = 27,744 n = 10,518
Gestational week, Median (p5–p95), weeks
  39.4 (37.0–41.1) 39.4 (36.9–41.3) 39.4 (37.0–41.1) 39.4 (37.0–41.1) 39.4 (37.0–41.3) 0.006a
Gestational week, n(%)
26–27 week 88 16 (0.10) 46 (0.11) 20 (0.07) 6 (0.06) <  0.001b
28–31 week 364 94 (0.6) 152 (0.4) 93 (0.3) 25 (0.2)  
32–36 week 3929 743 (4.5) 1674 (4.1) 1089 (3.9) 423 (4.0)  
37–41 week 91,454 15,694 (94.6) 39,224 (95.2) 26,495 (95.5) 10,041 (95.5)  
  1. a Kruskal-Wallis test
  2. b Chi-squared test