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. 2023 Mar 1;23:96. doi: 10.1186/s12887-023-03870-0

Table 2.

Quality assessment of included studies—cohort study and case–control study

Author Year Study population selection Intergroup comparability Outcome measurement Total points
Mai 2009 [25] 4 1 2 7
Lin 2015 [23] 4 2 2 8
Thomson 2010 [21] 2 1 2 5
Mckeever 2002 [15] 4 2 2 8
Macintyre 2010 [24] 4 2 1 7
Illi 2014 [33] 4 1 2 7
Ramsey 2007 [22] 3 1 2 6
Hsieh 2016 [35] 4 2 3 9
Mckeever 2002 [34] 4 2 2 8
Kang 2019 [32] 4 1 1 6
Bremner 2008 [16] 3 2 2 7
Liao 2015 [37] 4 1 1 6
Harris 2007 [26] 4 2 2 8