Baseline characteristics by diagnosis: all participants

SD: Standard deviation; IQR: Inter-quartile range; AD: Alzheimer's disease; VAD: Vascular dementia; DLB: Dementia with Lewy bodies; PDD: Parkinson's disease dementia; PD: Parkinson's disease. Denominators are given for prevalence (%) where data is incomplete.*Control vs. patients p = 0.457; Control vs. AD p = 0.036; control vs. VAD p = 0.027; Control vs. DLB p = 0.945; Control vs. PDD p = 0.031.**Control vs. all patient groups p***Control vs. AD p = 0.087; control vs. VAD p = 0.009; Control vs. DLB p = 0.005; Control vs. PDD p†Control vs. AD p = 0.013; control vs. VAD p††Control vs. AD p = 0.481; control vs. VAD p†††Control vs. AD p = 0.063; control vs. VAD p = 0.001; Control vs. DLB p = 0.151; Control vs. PDD p‡Control vs. AD p = 0.098; control vs. VAD p‡‡Control vs. AD p = 0.234; control vs. VAD p