TABLE 2.

Risk of bias of the included study [21]

	Authors’ judgement	Support for judgement
Random sequence generation	Inadequate	Allocated by alternation
Allocation concealment	Inadequate	No concealment
Blind outcome assessment	Inadequate	No blinding
Incomplete outcome data	Adequate	All participants who commenced the study are accounted for
Selective reporting (reporting bias)	Adequate	Data for all primary and secondary measures (detailed in the methods) has been reported
Other bias	Inadequate	Percentage predicted forced expiratory volume in 1 s was lower in the intervention group and fewer patients started pulmonary rehabilitation in the winter than in the control group. These covariates were reported as not being associated with outcomes but data was not provided. Pulmonary rehabilitation did not deliver similar improvements in routine clinical outcome measures between groups
Overall risk of bias	High	More than one criterion deemed inadequate