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Table 2 Summary of semen biochemical variables for study respondents

From: The association between iodine intake and semen quality among fertile men in China

 2010 WHO StandardsaWhole sample (n = 1098)Iodine deficiency group (n = 275)Iodine optimal group (n = 407)Iodine excess group (n = 416)
Semen volume (mL)1.53.02 (2.94, 3.09)3.09** (2.94, 3.25)2.92 (2.80, 3.03)3.06** (2.94, 3.18)
Semen concentration (million/ml)1558.23 (−10.89, 127.36)41.21*** (−10.48, 92.91)70.86 (− 68.49, 210.21)57.13*** (− 44.03, 158.29)
Semen count (million)39175.98 (− 791.93, 1143,90)128.68 (− 731.69, 989.05)208.92 (− 1866.47, 2284.32)175.02 (− 1274.32, 1624.37)
Semen motility (%)4051.33 (42.63, 60.03)51.75 (35.04, 68.47)51.61 (36.61, 66.60)50.78 (36.87, 64.68)
Progressive sperm (%)3243.85 (34.12, 53.59)44.08 (24.87, 63.28)44.16 (27.88, 60.44)43.41 (27.60, 59.22)
Nonprogressive sperm (%)17.48 (5.97, 8.98)7.68 (4.58, 10.79)7.45 (5.18, 9.71)7.37 (4.75, 10.00)
  1. UIC urinary iodine concentration. Group comparisons are performed by t-test for continuous variables and chi-squared tests for categorial variables using iodine optimal group as the reference group
  2. a2010 World Health Organization (WHO) recommendations for semen parameters
  3. ***, statistically significant at the 1% level; ** statistically significant at the 5% level; * statistically significant at the 10% level