PTH and chronic kidney disease: Kalaitzidis et al. further found that increasing PTH levels measured on a continuous model were associated with moderate or severe cognitive impairment on the MMSE (adjusted OR = 1.01, 95% CI: 1.00–1.01) and the clock-drawing test (aOR = 1.92, 95% CI: 1.23–2.99) after adjusting for the following confounders: CKD stage, age, presence of diabetes, and diastolic blood pressure [34•].