PTH and hearing loss disorder: Szeto et al. (35) analyzed the associations between 25(OH)D, PTH, total calcium, BMD, and hearing loss in 1,123 participants aged ≥70 years and found that 25(OH)D <20 ng/mL was the risk factors of low-frequency hearing loss (OR: 2.02, 95% CI: 1.28–3.19) and voice frequency hearing loss (OR: 1.96, 95% CI: 1.12–3.44), but not PTH and total calcium.