PTH and osteoporosis: A significantly higher rate of further fractures was associated with lower BMI (body mass index) (HR 0.925, CI 0.872–0.98; p = 0.009), lower parathyroid hormone levels (HR 0.986, CI 0.973–0.998; p = 0.026) and with the diagnosis of osteoporosis (HR 2.546, CI 1.192–5.438; p = 0.016).