Table 4.
Characteristics of systematic reviews that assessed the course/progress of cognitive impairment in people with schizophrenia
| Citation | Databases searched | Range of search year | Number of included studies | Sample size of studies included | Domain addressed | Concept addressed | Quality assessment |
|---|---|---|---|---|---|---|---|
| Shah et al. (2012) | –PubMed | –Between 1960 and 2009 | –23 studies | –Sample size systematically NR | –More than one domain | Course of CIPWS | Poor quality |
| Irani at al. (2010) | –MEDLINE | –From inception to November 30, 2007 and February 16, 2008, | –43 studies |
2110 PWS, 1738 HC form cross-sectional studies and –954 PWS from longitudinal studies |
–More than one domain | Course and factors associated | Moderate quality |
| Bozikas and Andreou (2011) | –PubMed | –Until 15 January 2010 | –26 studies | –Sample size is not reported systematically | –More than one domain | Progress and associated factors | Moderate quality |
| Szöke et al. (2008) | –MEDLINE | –From 1978 to 2006 | –53 studies | –2476 PWS and 324 HC | –General | Course and associated factors | Poor quality |
| Woodberry (2008) | –PubMed | –Until March 1, 2007 | –18 studies | –Sample size systematically NR | –IQ | Magnitude, and course | Moderate quality |
| Khandaker et al. (2011) | –MEDLINE–PubMed, PsycINFO and Embase | –From January 1984 until February 2011 | –14 studies | –4396 cases and over 745,000 HC | –IQ | Comparison and course | Moderate quality |
CIPWS cognitive impairment in people with schizophrenia, HC healthy controls, NR not reported, IQ intelligence quotient, PWS people with schizophrenia