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 |