Key characteristics of studies relating to PTH levels, parathyroid conditions, cognitive function and dementia.

MMSE: Mini Mental State Examination; CDR: Clinical Dementia Rating scale; MMS: Mini Mental State, NR: Not reported; CKD: chronic kidney disease.a:Study reporting results for more than one type of research design (i.e. prospective/pre-post and cross-sectional or case-control) but basic characteristics are the same, therefore only prospective designs are included here.b: No control group.c: mean age of six groups.d: studies included participants undergoing dialysis.e:unclear whether calcium /vitamin D is treated as a potential covariate or one of the predictors in linear regression models.Key characteristics of studies relating to PTH levels, parathyroid conditions, cognitive function and dementia.MMSE：简易精神状态检查表（Mini Mental State Examination）；CDR：临床痴呆评定量表（Clinical Dementia Rating scale）；MMS：简易精神状态（Mini Mental State）；NR：未报告（Not reported）；CKD：慢性肾脏病（chronic kidney disease）。a：该研究报告了多种研究设计类型的结果（即前瞻性/前后对照设计、横断面设计或病例对照设计），但各项设计的基础特征一致，故此处仅纳入前瞻性设计的结果。b：无对照组。c：六组研究对象的平均年龄。d：纳入接受透析治疗参与者的研究。e：在线性回归模型中，钙/维生素D是否被视为潜在协变量或预测因子之一尚不明确。以下为与甲状旁腺激素（PTH）水平、甲状旁腺疾病、认知功能及痴呆相关研究的核心特征。