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Table 2 Quality scores assessing the risk of bias using a modified Newcastle-Ottawa scale

From: A systematic review of depression and anxiety in medical students in China

Study type: Cross-sectional; Score: 1 = achieved, 0 = not achieved
Authors Representativeness of the sample Sample size Non-respondents Ascertainment of the exposure Comparability of subjects in different outcome groups (control for confounding) Assessment of the outcome A statistical test is appropriate Total score
Lin, 2018 [62] 0 1 1 1 1 1 1 6
Li, 2017 [63] 1 1 1 1 1 1 1 7
Pan, 2016 [64] 1 1 0 1 1 1 1 6
Li, 2015 [65] 0 1 1 1 1 1 1 6
Li, 2015 [66] 1 1 1 1 1 1 1 7
Zhai, 2006 [67] 0 1 1 1 1 1 1 6
Guo, 2014 [35] 0 1 1 1 1 1 1 6
Ren, 2013 [68] 0 1 1 1 1 1 1 6
Ruan, 2011 [69] 0 1 0 1 1 1 1 5
Sun, 2011 [70] 1 1 1 1 1 1 1 7
Feng, 2010 [71] 0 1 1 1 1 1 1 6
Shang, 2009 [72] 1 1 1 1 1 1 1 7
Li, 2009 [73] 0 1 1 1 1 1 1 6
He, 2009 [74] 0 1 1 1 1 1 1 6
Liu, 2009 [75] 0 1 1 1 1 1 1 6
Liang, 2007 [76] 0 1 1 1 1 1 1 6
Qu, 2014 [34] 0 1 1 1 1 1 1 6
Yang, 2005 [77] 0 1 1 1 1 1 1 6
Zhou, 2003 [78] 0 1 1 1 1 1 1 6
Yu, 2001 [79] 0 1 0 1 1 1 1 5
Wu, 2000 [80] 1 1 1 1 1 1 1 7