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Table 2 Risk of bias of the included cohort studies

From: Pulmonary rehabilitation and cardiovascular risk in COPD: a systematic review

First author

Population representative

Sample size adequate

Confounders

Statistical analysis

Missing data

Methodology of the outcome

Objective assessment

Gale 2011 [6]

3

2

3

3

3

3

3

Vanfleteren 2014 [7]

3

3

3

3

3

3

3

  1. 0 = Definitely no (therefore high risk of bias), 1 = Mostly no, 2 = Mostly yes, 3 = Definitely yes (therefore low risk of bias)