Table 1. Characteristics of the general male population (n = 7630).
| Characteristics | BMI < 21.60 (n = 1907) Mean (95% CI for mean) | BMI: 21.60–23.48 (n = 1908) Mean (95% CI for mean) | BMI: 23.49–25.61 (n = 1908) Mean (95% CI for mean) | BMI ≥ 25.62 (n = 1907) Mean (95% CI for mean) | Total (n = 7630) Mean (95% CI for mean) | p a , c |
|---|---|---|---|---|---|---|
| Age (years) | 30.83 (30.64, 31.02) | 31.78 (31.58, 31.98) | 32.16 (31.95, 32.38) | 32.21 (31.99, 32.43) | 31.75 (31.64, 31.85) | < 0.001 |
| Triglyceride | 87.55 (85.27, 89.83) | 106.81 (103.98, 109.64) | 127.90 (124.23, 131.56) | 153.93 (148.83, 159.04) | 119.06 (117.16, 120.95) | < 0.001 |
| Cholesterol | 179.18 (177.73, 180.62) | 188.62 (187.17, 190.07) | 192.64 (191.13, 194.16) | 198.11 (196.55, 199.68) | 189.64 (188.87, 190.40) | < 0.001 |
| HDL | 55.22 (54.63, 55.81) | 51.13 (50.61, 51.65) | 48.04 (47.54, 48.53) | 46.17 (45.71, 46.64) | 50.18 (49.91, 50.46) | <0.001 |
| LDL | 106.65 (105.33, 107.97) | 116.63 (115.26, 117.99) | 119.97 (118.57, 121.37) | 122.93 (121.51, 124.35) | 116.47 (115.77, 117.17) | < 0.001 |
| Cholesterol ratio | 3.38 (3.34, 3.42) | 3.84 (3.80, 3.89) | 4.16 (4.11, 4.21) | 4.44 (4.38, 4.49) | 3.95 (3.92, 3.97) | < 0.001 |
| CRP | 0.16 (0.15, 0.18) | 0.19 (0.17, 0.21) | 0.21 (0.19, 0.23) | 0.30 (0.26, 0.33) | 0.22 (0.20, 0.23) | < 0.001 |
| Prolactin | 13.21(12.76, 13.67) | 12.62 (12.26, 12.97) | 12.19 (11.85, 12.53) | 12.62 (12.24, 13.00) | 12.66 (12.47, 12.85) | 0.011 |
| SC b (M/ml) | 55.72 (53.74, 57.69) | 52.85 (51.15, 54.55) | 54.39 (52.62, 56.16) | 50.25 (48.50, 51.99) | 53.30 (52.40, 54.20) | < 0.001 |
| TSM b (%) | 65.29 (64.66, 65.92) | 65.23 (64.57, 65.88) | 64.98 (64.31, 65.66) | 64.86 (64.20, 65.51) | 65.09 (64.76, 65.41) | 0.299 |
| PRM b (%) | 46.00 (45.31, 46.70) | 46.21 (45.50, 46.93) | 46.44 (45.71, 47.17) | 46.04 (45.32, 46.77) | 46.18 (45.82, 46.53) | 0.832 |
| NSM b (%) | 68.40 (67.74, 69.06) | 67.19 (66.53, 67.85) | 67.03 (66.35, 67.70) | 66.25 (65.58, 66.92) | 67.22 (66.88, 67.55) | < 0.001 |
BMI: Body Mass Index, HDL: High Density Lipoprotein, LDL: Low Density Lipoprotein, Cholesterol Ratio: Cholesterol/HDL, CRP: C-Reactive Protein, SC: Sperm Concentration, TSM: Total Sperm Motility, PRM: Progressive Motility, NSM: Normal Sperm Morphology.
a by one-way analysis of variance (ANOVA).
b the p value of SC, TSM, PRM, NSM are 0.005, 0.442, 0.452, <0.001, respectively after adjustment for age, triglyceride, cholesterol, CRP, prolactin and smoking duration (years) by linear regression models.
c the Bonferroni corrected values of p < 0.008 were considered statistically significant.