“…In general, the relationship between cognitive impairment or dementia and quality of life is not uniform among different studies. Depending of the instruments, procedure, and setting, some authors did find an association between both dimensions [40][41][42] and other authors did not [43][44][45][46][47]. A similar situation occurs in PD, with studies showing a relationship between cognitive status and HRQoL [22,27,48,49], even in non-demented patients [50], and other studies which found only a weak association [51,52].…”