IGF1 and hypogonadism: Multivariate analysis identified age (OR = 1.149, 95% CI 1.052–1.256, P < 0.05), IGF-1 levels < -2 SD (OR = 1.832, 95% CI 1.095–3.067, P < 0.05), and hypogonadism (OR = 2.990, 95% CI 1.087–8.229, P < 0.05) as independent risk factors for low bone mass.