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Table 3 Anthropometric, reproductive, and lifestyle characteristics of women across Total Smoke Exposure groups

From: Joint effect of particulate matter and cigarette smoke on women’s sex hormones

Characteristics Level Statistics Total Smoke Exposure Test
nSM SM
Age [years]   N 84 44 t test; df = 126; p = 0.218
  Mean 29.8 29.0
  SD 3.2 2.9
Age at first child [years]   N 31 17 t test; df = 46; p = 0.055
  Mean 24.7 22.9
  SD 3.3 2.5
Parity status No N 52 28 Pearson Chi-square: 0.04, df = 1, p = 0.849
  % 61.9 63.6
Yes N 32 16
  % 38.1 36.4
Menarcheal age [years]   N 82 43 t test; df = 123; p = 0.876
  Mean 13.3 13.3
  SD 1.3 1.6
Cycle length [days]   N 84 44 Mann–Whitney U test, p = 0.625
  Median 28.0 29.0
  IQR 26.0–31.5 26.0–30.0
Height [cm]   N 84 44 t test; df = 126; p = 0.748
  Mean 164.6 164.2
  SD 6.0 6.2
Body fat [%]   N 83 44 t test; df = 125; p = 0.944
  Mean 25.2 25.1
  SD 6.4 5.4
Body mass index* [kg/m2]   N 88 44 Mann–Whitney U test, p = 0.475
  Median 21.1 22.1
  IQR 20.0–23.8 20.0–24.0
Body weight [kg]   N 84 44 t test; df = 126; p = 0.819
  Mean 59.7 60.0
  SD 8.5 8.7
Marital status Single N 34 15 Pearson Chi-square = 0.38, df = 1, p = 0.541
  % 40.5 34.9
Ever married N 50 28
  % 59.5 65.1
  1. *Significance was set at p = 0.05