Table 2. Age and anthropometric indexes by semen parameters.
| Characteristics | Quartile | Concentration (M/ml) median (n = 7630) Mean (95% CI for mean) | % Total Motility median (n = 7613) Mean (95% CI for mean) | % Progressive Motility median (n = 7601) Mean (95% CI for mean) | % Normal Morphology median (n = 7624) Mean (95% CI for mean) |
|---|---|---|---|---|---|
| Age a (years) | Q1: <29 | 55.34 (53.39, 57.30) | 67.56 (66.94, 68.17) | 48.23 (47.50, 48.96) | 69.45 (68.76, 70.14) |
| Q2: 29–30 | 53.84 (52.01, 55.66) | 66.84 (66.16, 67.52) | 47.59 (46.82, 48.35) | 68.70 (68.00, 69.40) | |
| Q3: 31–33 | 51.89 (50.17, 53.61) | 65.18 (64.58, 65.78) | 46.33 (45.66, 47.01) | 66.87 (66.25, 67.49) | |
| Q4: ≥34 | 52.60 (50.89, 54.31) | 61.719 (61.05, 62.39) | 43.33 (42.64, 44.01) | 64.64 (64.00, 65.29) | |
| p b , adjusted p | 0.015, 0.004 | <0.001, <0.001 | <0.001, <0.001 | <0.001, <0.001 | |
| BMI a (kg/m 2) | Q1: <21.60 | 55.72 (53.74, 57.69) | 65.29 (64.66, 65.92) | 46.00 (45.31, 46.70) | 68.40 (67.74, 69.06) |
| Q2: 21.60–23.48 | 52.85 (51.15, 54.55) | 65.23 (64.57, 65.88) | 46.21 (45.50, 46.93) | 67.19 (66.53, 67.85) | |
| Q3: 23.49–25.61 | 54.39 (52.62, 56.16) | 64.89 (64.31, 65.66) | 46.44 (45.71, 47.17) | 67.03 (66.35, 67.70) | |
| Q4: ≥25.62 | 50.25 (48.50, 51.99) | 64.86 (64.20, 65.51) | 46.04 (45.32, 46.77) | 66.25 (65.58, 66.92) | |
| p b , adjusted p | <0.001, 0.005 | 0.299, 0.403 | 0.832, 0.488 | <0.001, <0.001 | |
| Waist circumference (cm) | Q1: <75.00 | 55.05 (53.04, 57.06) | 65.66 (64.97, 66.34) | 45.80 (45.06, 46.55) | 68.29 (67.57, 69.01) |
| Q2: 75.00–79.00 | 54.39 (52.50, 56.28) | 64.92 (64.24, 65.60) | 46.24 (45.48, 46.99) | 67.01 (66.30, 67.73) | |
| Q3: 80.00–85.00 | 54.03 (52.30, 55.75) | 65.21 (64.59, 65.84) | 46.41 (45.74, 47.09) | 67.38 (66.75, 68.01) | |
| Q4: ≥86 | 50.29 (48.65, 51.94) | 64.73 (64.10, 65.36) | 46.246 (45.56, 46.94) | 66.41 (65.79, 67.04) | |
| p b , adjusted p | <0.001, 0.685 | 0.108, 0.939 | 0.394, 0.129 | 0.001, 0.219 | |
| Hip circumference (cm) | Q1: <92.00 | 56.11 (53.96, 58.27) | 65.67 (64.98, 66.36) | 45.85 (45.08, 46.61) | 68.22 (67.51, 68.92) |
| Q2: 92.00–95.99 | 52.93 (51.27, 54.59) | 64.90 (64.25, 65.55) | 46.10 (45.39, 46.81) | 66.95 (66.29, 67.61) | |
| Q3: 96–99.99 | 54.67 (52.86, 56.47) | 65.06 (64.41, 65.71) | 46.37 (45.66, 47.08) | 67.65 (66.99, 68.32) | |
| Q4: ≥100 | 50.19 (48.54, 51.84) | 64.91 (64.28, 65.53) | 46.39 (45.71, 47.08) | 66.30 (65.66, 66.94) | |
| p b , adjusted p | <0.001, 0.457 | 0.185, 0.543 | 0.258, 0.218 | 0.001, 0.712 | |
| Waist-to-hip ratio (%) | Q1: <80 | 53.89 (51.91, 55.87) | 65.25 (64.50, 66.01) | 46.41 (45.57, 47.24) | 68.238 (67.435, 69.041) |
| Q2: 80–83 | 54.56 (52.75, 56.37) | 65.34 (64.72, 65.95) | 46.09 (45.42, 46.76) | 67.172 (66.537, 67.808) | |
| Q3: 84–87 | 53.27 (51.64, 54.91) | 65.20 (64.60, 65.80) | 46.29 (45.63, 46.96) | 67.318 (66.703, 67.934) | |
| Q4: ≥88 | 51.50 (49.68, 53.31) | 64.64 (63.97, 65.30) | 46.05 (45.32, 46.78) | 66.416 (65.757, 67.074) | |
| p b , adjusted p | 0.035, 0.991 | 0.178, 0.383 | 0.660, 0.853 | 0.002, 0.579 | |
| Waist-to-height ratio (%) | Q1: <44 | 54.62 (52.74, 56.51) | 65.46 (64.82, 66.10) | 45.93 (45.23, 46.63) | 68.00 (67.33, 68.67) |
| Q2: 44–46 | 53.72 (51.99, 55.46) | 65.28 (64.63, 65.93) | 46.74 (46.02, 47.46) | 67.21 (66.54, 67.89) | |
| Q3: 47–49 | 53.71 (51.94, 55.48) | 65.25 (64.59, 65.92) | 45.92 (45.21, 46.64) | 66.97 (66.29, 67.65) | |
| Q4: ≥50 | 51.21 (49.39, 53.03) | 64.48 (63.79, 65.11) | 46.20 (45.48, 46.93) | 66.72 (66.06, 67.37) | |
| p b , adjusted p | 0.012, 0.052 | 0.038, 0.735 | 0.997, 0.529 | 0.007, 0.004 | |
| Body fat (%) | Q1: <19.80 | 54.36 (52.42, 56.31) | 64.62 (63.96, 65.28) | 45.59 (44.86, 46.31) | 67.63 (66.95, 68.31) |
| Q2: 19.80–23.29 | 53.26 (51.55, 54.97) | 64.88 (64.23, 65.53) | 45.80 (45.09, 46.50) | 67.13 (66.47, 67.79) | |
| Q3: 23.30–26.79 | 54.32 (52.50, 56.14) | 65.54 (64.89, 66.20) | 46.79 (46.07, 47.51) | 67.10 (66.43, 67.77) | |
| Q4: ≥26.80 | 51.30 (49.55, 53.04) | 65.33 (64.69, 65.97) | 46.55 (45.84, 47.26) | 67.03 (66.37, 67.69) | |
| p b , adjusted p | 0.048, 0.846 | 0.062, 0.209 | 0.018, 0.403 | 0.232, 0.057 | |
| Smoking duration a (years) | Q1: 0 | 57.47 (54.08, 62.85) | 65.08 (63.22, 66.95) | 45.79 (45.33, 46.25) | 67.70 (65.49, 69.91) |
| Q2: <3 | 53.94 (52.32, 56.32) | 64.58 (64.16, 65.01) | 44.18 (42.02, 46.34) | 67.04 (66.61, 67.47) | |
| Q3: 3–20 | 53.46 (51.56, 54.61) | 66.12 (65.29, 66.95) | 47.07 (46.13, 48.02) | 67.44 (66.55, 68.34) | |
| Q4: ≥20 | 52.01 (50.04, 53.99) | 65.84 (65.15, 66.52) | 46.88 (46.11, 47.66) | 67.49 (66.79, 68.19) | |
| p b , adjusted p | 0.132, 0.036 | 0.001, 0.275 | 0.002, 0.667 | 0.328, 0.556 |
the p values are calculated by one-way analysis of variance (ANOVA).
the adjusted p values are adjustment for age, BMI, triglyceride, cholesterol, CRP, prolactin and smoking duration (years) by linear regression models.
a the adjusted p values are adjustment for age, BMI, triglyceride, cholesterol, CRP, prolactin and smoking duration (years) but excluded itself by linear regression models.
b the Bonferroni corrected values of p < 0.008 were considered statistically significant.