“…The participation rate ranged between 47% [24] and 89% [18]; it was over 70% in more than 40% of studies. There were 27 longitudinal studies [18, 20-23, 25, 28, 29, 31, 34-49, 51, 52] and eight cross-sectional studies [19,24,26,27,30,32,33,50] (three using databases from electronic medical files or administrative databases [29,32,50]). Participants were living in a private home or nursing home (n = 27) [18-21, 23-29, 31, 33, 36-42, 44-49, 51], only living in private homes (n = 3) [34,43,50], and not specified (n = 5) [22,30,32,35,52].…”