Leisure Activities in Late Life in Relation to Dementia Risk: Principal Component Analysis Paillard-Borg S.a, b · Fratiglioni L.a, b · Winblad B.a · Wang H.-X.a, b Author affiliations aAging Research Center (ARC), Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, and bStockholm Gerontology Research Center, Stockholm, Sweden