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Table 2 Risk of bias in included cohort studies

From: Impact of hypokalemia on peritonitis in peritoneal dialysis patients: a systematic review

Study and year (reference) Representativeness Selection of controls Exposure ascertained Not present at outset Comparability Outcome assessment Duration of follow-up Adequacy of follow-up
Ribeiro, 2015 [12] 1 1 1 1 2 1 0 1
Fan, 2014 [16] 1 1 1 1 2 1 1 0
Liawnoraset, 2011 [15] 1 1 1 1 0 1 1 0
Su, 2012 [13] 1 1 1 1 2 1 1 1
Chuang, 2009 [14] 1 1 1 0 0 1 1 1
  1. The Newcastle-Otawa Scales were used to assess risk of bias for the cohort studies. Each domain was rated on a maximum of one star, except comparability, which can be given up to two stars. 0, high risk of bias or no description; 1 or 2, low risk of bias