Table 1. Characteristics of idiopathic infertile males and fertile controls.
| Characteristic | Controls (n = 54)a | Cases | ||
| Case 1 (n = 30)b | Case 2 (n = 64)c | Case all (n = 94)d | ||
| Age (years, mean ± SD) | 29.52±3.72 | 29.67±4.91 | 28.75±4.34 | 29.04±4.52 |
| BMI (kg/m2, mean ± SD)e | 22.42±2.54 | 21.04±4.92 | 23.11±2.93 | 22.45±3.78 |
| Smoking status [n (%)] | ||||
| Yes | 19 (35.2) | 11 (36.7) | 27 (42.2) | 38 (40.4) |
| No | 35 (64.8) | 19 (63.3) | 37 (57.8) | 56 (59.6) |
| Alcohol drinking [n (%)] | ||||
| Yes | 13 (24.1) | 4 (13.3) | 10 (15.6) | 14 (14.9) |
| No | 41 (75.9) | 26 (86.7) | 54 (84.4) | 80 (85.1) |
| Abstinence time [n (%)] | ||||
| <4 | 36 (66.7) | 14 (46.7) | 33 (51.6) | 47 (50.0) |
| 4–7 | 17 (31.5) | 11 (36.7) | 23 (35.9) | 34 (36.2) |
| >7 | 1 (1.9) | 5 (16.7) * | 8 (12.5) | 13 (13.8) |
| Ejaculate volume (ml, mean ± SD) | 4.24±1.04 | 3.11±1.16* | 3.11±1.12* | 3.11±1.13* |
| Sperm concentration (106/ml)f | 41.25 (29.22–58.14) | 61.65 (40–103.5)* | 9.52 (3.86–14.33)* | 14.08 (5.40–36.55)* |
| Sperm motility (%)f | 55.79 (44.00–67.40) | 64.83 (43.48–79.21) | 30.56 (16.30–41.62)* | 36.03 (18.18–53.22)* |
a
Control: fertile men.
b
Case 1: idiopathic infertile men with normozoospermia.
c
Case 2: idiopathic infertile men with oligozoospermia.
d
Case all: the sum of Case 1 and Case 2.
e
BMI: body mass index.
f
Values are given as median and interquartile range (IQR).
*P<0.05 when compared between case and control groups.