Thirty-four percent (179 out of 522) had an abnormal PCT. The PCT model contained previous pregnancy [odds ratio (OR) 2.1; 95% confidence interval (CI) 1.3-3.5], semen volume (OR 0.88; 95% CI 0.77-0.99), sperm concentration (OR 0.96; 95% CI 0.94-0.97), sperm motility (OR 0.97; 95% CI 0.96-0.98) and sperm morphology (OR 2.7; 95% CI 1.2-6.8). The area under the ROC curve of the model was 0.81