Characteristics of subjects
| Discovery (n=811) | Replication (n=779) | P value | |
| Age (years) | 20.7±1.7 | 31.2±4.8 | <0.0001 |
| BMI (kg/m2) | 21.5±2.5 | 23.3±3.0 | <0.0001 |
| Ejaculation abstinence (hours) | 79.8±39.5 | 194.6±326.8 | <0.0001 |
| Sperm motility (%) | 60.3±14.5 | 59.4±20.7 | 0.32 |
Data are presented as mean±SD. P values were obtained with Student’s unpaired t-test.
BMI, body mass index.