PLOD1 and cryptorchidism: While after controlling for age of starting treatment, BMI, basal LH level, basal FSH level, basal testicular size, and cryptorchid, rhGH treatment (HR = 2.294, 95% CI: 1.143-4.604, P = 0.019) was still a positive predictor for the shortest time to spermatogenesis (Table 3).