PTH and Osteopenia: The same analysis stratified by sex showed that in men, only age (OR 1.05, 95% CI 1.01–1.09) influenced BMD, while in women, BMD was influenced by age (OR 1.04, 95% CI 1.01–1.07), calcium intake (OR 1.85, 95% CI 1.01–3.45), PTH level (OR 1.01, 95% CI 1.008–1.02), and previous diagnosis of osteopenia (OR 19.33, 95% CI 8.12–54.54) or osteoporosis (OR 28.22, 95% CI 11.56–85.28).