“…The association between SMC and incidence of dementia has been suggested to be stronger in people with less severe cognitive impairment [1, 16] but weaker in those with depression [11]. SMC is associated with a number of other states including depression [6, 8, 17–19], anxiety [17, 18], worse physical health [6, 20] and personality traits, such as neuroticism [6, 21]. Inconsistencies may arise in part because of different SMC measures [1, 22], different sample populations, limited cognitive tests, and failure to take depression into consideration [1, 21].…”