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Table 1 Demographic characteristics of infertile men

From: Semen quality pattern and age threshold: a retrospective cross-sectional study of 71,623 infertile men in China, between 2011 and 2017

Variables2011(n = 6236)2012(n = 8529)2013(n = 10,205)2014(n = 11,809)2015(n = 12,331)2016(n = 11,075)2017(n = 11,438)P value
Age (y)33(29–37)33(29–37)33(29–38)33(29–38)33(29–38)33(29–39)33(29–39)0.351
Height(m)1.69(1.65–1.74)1.70(1.66–1.76)1.71(1.66–1.76)1.69(1.65–1.75)1.72(1.67–1.76)1.70(1.65–1.74)1.71(1.66–1.75)0.218
Weight(kg)66.3(59.5–74.0)70.5(62.5–75.0)66.2(59.8–74.5)66.5(60.5–74.8)69.5(61.5–74.2)70.1(61.8–75.0)68.3(61.3–74.3)0.237
BMI (kg/m2)23.1(21.5–25.0)24.3(21.9–26.4)22.5(20.7–24.8)23.2(21.6–25.2)23.4(21.8–25.2)24.2(22.3–25.4)23.3(21.4–25.0)0.176
Abstinence(d)4(3–5)4(3–5)4(3–5)4(3–5)4(3–5)4(3–5)4(3–5)0.777
Smokers(%)66.5%65.2%58.9%61.4%65.6%62.5%66.1%<  0.001
Drinkers(%)17.3%18.7%18.5%19.6%20.7%18.5%19.3%<  0.001
  1. BMI Body mass index