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Table 1 Selected characteristics in relation to group (symptom-free (SF), nausea only (NP), and nausea and vomiting (NVP)), including total sample used and those excludeda

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

  SF NP NVP Total sample Excludedb
(n = 14 234) (n = 20 371) (n = 17 070) (n = 51 675) (n = 41 195)
Maternal age at delivery (y), n = 51 675 Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD)
30.3 (4.5) 30.8 (4.4) 29.2 (4.6) 30.1 (4.6) (missing = 0 %) 29.8 (4.8) (missing = 1 %)
BMI at pregnancy start (kg/m2), n = 51 675 23.9 (4.1) 23.9 (4.1) 24.3 (4.6) 24.0 (4.3) (missing = 0 %) 24.4 (4.4) (missing = 16.9 %)
Energy intake (kJ), n = 51 675 9539 (2527.8) 9706.2 (2489.0) 9830.7 (2722.1) 9701.5 (2581.2) (missing = 0 %) 9644.5 (4170.1) (missing = 20.8 %)
  n (%) n (%) n (%) n (%) n (%)
Parity, n = 51 648 Para 0 8947 (62.9) 9475 (46.5) 9070 (53.2) 27 492 (49.8) (missing = 0.1 %) 20 513 (53.2) (missing = 0.7 %)
Maternal education (y), n = 51 675 ≤ 12 y 4200 (30.2) 5535 (27.7) 5755 (34.5) 15 490 (30.0) (missing = 2.1 %) 13 402 (32.5) (missing = 13.2 %)
Smoking during pregnancy, n = 51 329 Daily 946 (6.7) 805 (4.0) 803 (4.7) 2554 (4.9) (missing = 0.7 %) 2629 (6.4) (missing = 14.4 %)
  1. aExcerpt of sample characteristics from Chortatos et al. [10]
  2. bTotal MoBa sample n = 108 842 children, minus 1906 2nd or 3rd order children from multiple pregnancies = 106 936 women. Minus 51 675 women included in sample = 55 261. Excluding 14 066 women with ≥1 participation in MoBa gives 41 195 unique cases