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Table 1 Demographic characteristics of the study participants (N = 1780)

From: The association between ambient temperature and sperm quality in Wuhan, China

CharacteristicsN (%)Mean ± SD
Sperm concentration (mln/ml)Percentage of normal sperm morphology (%)Progressive motility (%)
Body mass index (kg/m2)
  < 18.573(4.1)79.3 ± 49.119.5 ± 17.728.1 ± 14.2
 18.5 ~ 251146(64.4)77.0 ± 52.120.9 ± 20.029.4 ± 16.7
  > 25561(31.5)74.6 ± 46.220.5 ± 19.930.1 ± 16.1
Age (years)
  < 30363(20.4)76.3 ± 57.919.1 ± 19.230.4 ± 16.1
 30–34759(42.6)76.53 ± 49.420.4 ± 19.430.1 ± 16.8
 35–39444(24.9)75.0 ± 47.221.3 ± 20.228.3 ± 16.1
  ≥ 40214(12.1)78.2 ± 44.323.1 ± 21.928.5 ± 15.8
Education
 Less than secondary education498(28.0)73.7 ± 49.819.8 ± 19.229.2 ± 16.7
 Secondary education686(38.5)76.5 ± 47.621.7 ± 20.329.0 ± 15.8
 College and higher596(33.5)78.2 ± 53.120.2 ± 19.830.4 ± 16.6
Smoking
 Non-smokers1129(63.4)77.6 ± 51.220.7 ± 19.929.9 ± 16.6
 Smokers651(36.6)74.0 ± 48.120.6 ± 19.928.8 ± 15.9
Season
 Spring530(29.8)70.4 ± 43.327.3 ± 24.229.2 ± 15.1
 Summer487(27.4)74.4 ± 47.919.0 ± 18.429.6 ± 17.1
 Autumn448(25.1)82.6 ± 59.314.4 ± 12.229.2 ± 16.2
 Winter315(17.7)80.1 ± 48.720.9 ± 19.630.4 ± 17.4
Days abstaining (days)
 2 ~ 3307(17.2)74.79 ± 47.3217.38 ± 16.8629.99 ± 16.84
 4 ~ 51009(56.7)75.57 ± 53.1719.65 ± 18.9628.77 ± 16.38
 6 ~ 7464(26.1)78.95 ± 45.0325.19 ± 22.9130.95 ± 16.04