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Table 2 Quality assessment of eligible studies with Newcastle−Ottawa Scale

From: Mortality of site-specific cancer in patients with schizophrenia: a systematic review and meta-analysis

First author, year

Representativeness of exposed cohort

Selection of unexposed cohort

Ascertainment of exposure

Outcome of interest not present at start of study

Comparability based on the design or analysis

Ascertainment of outcome

Follow-up long enough for outcomes to occur

Adequacy of followup

Total quality scores

Saku, 1995 [7]

*

–

*

*

*

*

*

–

6

Perini, 2014 [8]

*

–

*

*

*

*

*

–

6

Tran, 2009 [9]

*

–

*

*

*

*

*

–

6

Olfson, 2015 [10]

*

–

*

*

*

*

*

*

7

Brown, 2010 [22]

*

–

*

*

*

*

*

–

6

Kredentser, 2014 [23]

*

–

*

*

*

*

*

–

6

Crump, 2013 [24]

*

*

*

*

*

*

*

–

7

  1. Asterisk represents a point