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Serum levels of testosterone (upper) and LH (lower) by persistent hypogonadotropic hypogonadism (PHH) status after severe TBI in men. Data represent mean ± SEM. Testosterone levels were significantly lower in the PHH group at week 1 (p<0.05) and weeks 6–52 (p<0.001). LH levels were significantly lower in the PHH group at weeks 10, 12 (p<0.05), 14 (p<0.01), 16, and 24 (p<0.05).
