There were significant differences between the groups in terms of the presence of osteoporosis and PTH, bone-specific alkaline phosphatase, serum calcium, serum phosphorus, and 25-OH vitamin D levels (p = 0.001, = 0.000, = 0.000, = 0.004, = 0.000, and = 0.009, respectively). Here, PTH is linked to osteoporosis.