Skip to main content

Table 2 Anthropometric, reproductive, and lifestyle characteristics of women across PM10 groups

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

Characteristics Level Statistics PM10 exposure Test
Low High
Age [years]   N 60 70 t test; df = 128; p = 0.032
  Mean 28.9 30.1
  SD 2.8 3.3
Age at first child [years]   N 20 30 t test; df = 48; p = 0.570
  Mean 24.5 23.9
  SD 2.3 3.6
Parity status No N 40 40 Pearson Chi-square: 1.2, df = 1, p = 0.266
  % 66.7 57.1
Yes N 20 30
  % 33.3 42.9
Menarcheal age [years]   N 60 68 t test, separate variance estimates; df = 106; p = 0.060
  Mean 13.5 13.0
  SD 1.6 1.2
Cycle length [days]   N 61 70 Mann–Whitney U test, p = 0.115
  Median 29.0 27.5
  IQR 26.0–32.0 26.0–30.0
Height [cm]   N 61 70 t test; df = 129; p = 0.715
  Mean 164.3 164.7
  SD 6.0 6.1
Body fat [%]   N 60 69 t test; df = 127; p = 0.104
  Mean 26.1 24.3
  SD 5.4 6.5
Body mass index* [kg/m2]   N 61 70 Mann–Whitney U test, p = 0.076
  Median 22.5 20.8
  IQR 20.3–24.3 19.9–23.3
Body weight [kg]   N 60 70 t test; df = 128; p = 0.282
  Mean 60.8 59.1
  SD 8.1 9.0
Marital status Single N 24 26 Pearson Chi-square = 0.2; df = 1, p = 0.681
  % 40.7 37.1
Ever married n 35 44
  % 59.3 62.9
Smoking status Non-smoker N 43 60 Pearson Chi-square = 3.4, df = 1, p = 0.066
  % 74.1 87.0
Smoker N 15 9
  % 25.9 13.0
Living with smoker No N 38 54 Pearson Chi-square = 2.6, df = 1, p = 0.109
  % 65.5 78.3
Yes N 20 15
  % 34.5 21.7
Total Smoke Exposure nSM N 32 51 Pearson Chi-square = 4.9, df = 1, p = 0.027
  % 55.2 73.9
SM N 26 18
  % 44.8 26.1
  1. IQR interquartile range (Q1–Q3)
  2. *Body mass index was calculated as a participant’s weight (in kilograms) divided by the square of participant’s height (in metres)