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Table 1 Comparison of maternal characteristics between the groups

From: Maternal type 1collagen N-terminal telopeptide levels in severe hyperemesis gravidarum

  Severe HG group (n = 20) Control group (n = 20) P value
Maternal age (year) 26.95 ± 2.35 26.90 ± 2.36 0.947
Gestational weeks 10.30 ± 1.22 10.35 ± 1.23 0.898
Pre-pregnancy BMI (kg/m2) 24.76 ± 1.34 24.67 ± 1.27 0.829
First trimester weight loss ≥5 kg 19(95%) 0(0%) < 0.001
Nulliparity 13(65%) 12(60%) 0.752
Exercise regularly 0(0%) 3(15%) 0.083
Family history of osteoporosis 3(15%) 3(15%) 1
Caffeine intake 0(0%) 0(0%) 1
Sunlight exposure 0 (0%) 4 (20%) 0.021
  1. HG: hyperemesis gravidarum, BMI: body mass index
  2. The Shapiro-Wilk’s test was used to test the normality assumption of the data. Levene’s test was used for the variance in homogeneity assumption. The values were expressed as the mean ± standard deviation, median (25–75th percentile), or n (%). The parametric comparisons were made using a t-test or z-test, and the nonparametric comparisons were made using the Mann-Whitney U test. All of the comparisons were made with the PASW Statistics 18 program, and a p value of < 0.05 was considered to be statistically significant