Table 2.

Category A: General and unspecified cognitive impairment

Reference	Sample size	Sample type	Country	Research design	Main cognitive measures (abbreviations in table 2.4)	Prevalence	Quality rating
Burra, et al. (2009)	n/a	Review of 22 studies focussed on adults aged over 18, recruited from range of homeless (HL) services	International	Systematic review	MMSE score—range from 22 studies	4%–7% CI	Good
Depp, et al. (2015)	2,969 (pooled)	Review of 24 studies, mean sample age of 46.1, recruited from range of HL services	International	Systematic review	Cognitive impairment rates pooled from 24 studies	25% CI	Good
Ennis, et al. (2015)	n/a	Review of 11 studies, mean sample age of 40.75, recruited from range of HL services	International	Systematic review	n/a	n/a	Good
Joyce and Limbos (2009)	49	HL adult males aged 55 or older living in a HL shelter	Canada (Toronto)	Cross‐sectional study, interviews Review of medical records	MMSE	37.9% CI	Poor
Nishio, et al. (2017)	114	HL adults with mean age of 54, recruited with help of support centre.	Japan (n/a)	Diagnostic interview Questionnaire	WAIS III	34.2% CI	Fair
Okamura, et al. (2017)	51	HL adult males aged 65 or over living in HL shelters	Japan (Tokyo)	Psychiatric Interviews	MMSE	78.4% CI	Poor
Rogoz and Burke (2016)	171	HL adults aged 45 and over recruited from shelters, hospitals, hostels and housing agencies	Australia (Sydney)	Cognitive impairment screening Diagnostic interview	MMSE Battery of CI tests—clock drawing test, verbal fluency test, TMT	78% CI	Fair