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
Characteristic | Whole 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) |