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Table 1 Summary of characteristics of study male participants (means ± SD, or % ± SD) by iodine status groups

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

CharacteristicWhole Sample (n = 1098)Iodine deficiency group (n = 275)Iodine optimal group (n = 407)Iodine excess group (n = 416)
Age (years)27.47 (3.85)27.42 (3.79)27.54 (3.98)27.42 (3.75)
BMI (kg/m2)23.02 (2.58)23.1 (2.67)22.95 (2.63)23.04 (2.47)
Education
 Primary school and less (%)3(0.17)1(0.09)2(0.16)5(0.21)
 Middle and high school (%)67(0.47)68(0.47)64(0.48)71(0.46)
 College and above (%)30(0.46)31(0.46)34(0.47)25(0.43)
Hukou status
 Urban (%)38(0.49)33(0.47)36(0.48)43(0.50)
 Rural (%)48(0.50)48(0.50)49(0.50)48(0.50)
 Suburban (%)14(0.35)19(0.4)14(0.35)10(0.30)
Smoking (%)36(0.48)39(0.49)32(0.47)37(0.48)
Drinking habits
 Never-drinking (%)47(0.50)40(0.49)52(0.50)45(0.5)
 Occasional-drinking (%)7(0.25)8(0.28)6(0.24)7(0.25)
 Often-drinking (%)47 (0.50)52(0.50)42(0.49)48(0.5)
Abstinence duration (days)4.12 (1.52)4.08(1.52)4.12(1.51)4.15(1.54)
  1. BMI body mass index. Iodine deficient group, UIC < 100 μg/L; iodine optimal group, 100 ≤ UIC < 200 μg/L; iodine excess group, UIC ≥ 200 μg/L