Main findings of non-surgical studies relating to PTH levels, parathyroid conditions, cognitive function and dementia.

Note: Empty cells indicate no relevant results. Arrows and dashes indicate the number of tests conducted under each domain.a: Study reporting results for more than one type of research design (e.g. prospective and cross-sectional, pre-post surgery and case-control).b: P values not fully reported.c: studies included participants undergoing dialysis↓: Poorer performance compared to controls or in relation to PTH (p –: No statistically significant association/difference (p Main findings of non-surgical studies relating to PTH levels, parathyroid conditions, cognitive function and dementia.