From: The association between iodine intake and semen quality among fertile men in China
(1) | (2) | (3) | (4) | (5) | |
---|---|---|---|---|---|
Semen Volume b | Semen concentration b | Semen count b | Semen Motility c | Time to pregnancy | |
Unrainy iodine level: reference group (iodine optimal) | |||||
Iodine deficiency | 0.05* (0.03) | −0.58*** (0.05) | − 0.52*** (0.06) | 0.02 (0.03) | 3.49*** (0.39) |
Iodine Excess | 0.06* (0.03) | −0.26*** (0.04) | −0.20*** (0.05) | − 0.02 (0.02) | 1.42*** (0.28) |
BMI category: reference group (normal weight) | |||||
underweight | −0.01 (0.06) | 0.05 (0.10) | 0.04 (0.13) | −0.14** (0.06) | − 0.54 (0.73) |
Overweight | 0.01 (0.03) | −0.04 (0.05) | −0.02 (0.13) | 0.01 (0.03) | 0.07 (0.36) |
Obese | 0.02 (0.10) | 0.40** (0.16) | 0.42** (0.26) | −0.08 (0.09) | 3.52*** (1.21) |
Drink frequency: reference group (never drink) | |||||
Occasional drink | 0.01 (0.05) | −0.02 (0.08) | −0.00 (0.10) | − 0.07 (0.05) | −0.77 (0.73) |
Often drink | 0.01 (0.02) | 0.11*** (0.04) | 0.13*** (0.05) | −0.03 (0.02) | 0.11 (0.29) |
Smoking | −0.01 (0.02) | −0.03 (0.04) | − 0.04 (0.05) | 0.01 (0.02) | 1.05*** (0.31) |
Sexual abstinence duration | 0.02** (0.01) | 0.04*** (0.01) | 0.06*** (0.01) | 0.00 (0.01) | −0.19** (0.09) |
Age | 0.00 (0.00) | 0.01** (0.00) | 0.02*** (0.01) | −0.00 (0.00) | 0.04 (0.04) |
Per capita GDP | 0.00* (0.00) | −0.00 (0.00) | 0.00 (0.00) | −0.00** (0.00) | 0.00 (0.00) |
Poor air quality | 0.04 (0.03) | 0.09** (0.04) | 0.13*** (0.05) | −0.07*** (0.02) | 1.19*** (0.30) |
Observations | 1098 | 1098 | 1098 | 1098 | 1098 |