“…Controls were members of the cohort, who at the given time had not had an incident lowtrauma nonvertebral fracture after cohort entry, and who were matched with regard to time in study, age in years, baseline clinical diagnosis of osteoporosis or BMD T-score less than or equal to −2.5, baseline prevalent vertebral deformity (at least grade 2), baseline prevalent low-trauma fracture, and availability of baseline BMD [14]. If available, up to three controls were randomly selected per case.…”