Table A3.
Distribution of baseline characteristics by semen parameters.
| Demographic Characteristics | Semen Parameters | |||
|---|---|---|---|---|
| Normal a (N = 275) | Sperm Count b <39 Million (N = 27) | Sperm Concerntration b <15 Million/mL (N = 21) | Percentage of Moving Forward Sperm b <32% (N = 117) | |
| Age (Years) mean ± SD | 30.6 ± 4.0 | 30.3 ± 3.9 | 31.4 ± 4.8 | 31.5 ± 4.8 |
| BMI (Kg·m−2) mean ± SD | 24.2 ± 3.2 | 23.7 ± 2.6 | 23.7 ± 2.6 | 23.3 ± 2.9 |
| Education (Years) | ||||
| ≤15 | 72 (26.2) | 8(29.6) | 6 (28.6) | 35 (29.9) |
| 16 | 143 (52.0) | 8(29.6) | 6 (28.6) | 52 (44.4) |
| ≥17 | 60 (21.8) | 11(40.7) | 9 (42.9) | 30 (25.6) |
| Income (¥104/y) | ||||
| <10 | 87 (31.6) | 11 (40.7) | 6 (28.6) | 40 (34.2) |
| 10–30 | 136 (49.5) | 12 (44.4) | 12 (57.1) | 65 (55.6) |
| >30 | 29 (10.6) | 2 (7.4) | 1 (4.8) | 4 (3.4) |
| Refuse to answer | 23 (8.4) | 2 (7.4) | 2 (9.5) | 8 (6.8) |
| Current Smoking (No./day) | ||||
| 0 | 213 (77.5) | 21 (77.9) | 20 (95.2) | 91 (77.8) |
| 1–10 | 44 (16.0) | 5 (6.2) | 1 (4.8) | 22 (18.8) |
| >10 | 18 (6.6) | 1 (9.6) | 0 (0.0) | 4 (3.4) |
| Drinking c | ||||
| Never | 90 (32.7) | 7 (26.0) | 8 (38.1) | 47 (40.2) |
| Seldom | 171 (62.2) | 20 (74.1) | 13 (61.9) | 62 (53.0) |
| Frequent | 14 (5.1) | 0 (0.0) | 0 (0.0) | 8 (6.8) |
| Abstinence Time (days) | ||||
| ≤3 | 86 (31.3) | 14 (51.9) | 10 (47.6) | 32 (27.4) |
| >3, ≤5 | 92 (33.5) | 4 (14.8) | 5 (23.8) | 36 (30.8) |
| >5 | 97 (35.3) | 9 (33.3) | 6 (28.6) | 49 (41.9) |
a All of the four sperm parameters (concentration, motility, morphology and total number) above the WHO reference levels; b A subject may contribute data to more than one category; c Drinking status definition: Never (<1/month), Seldom (≥1/month, <1/week), Frequent (≥1/week).