Falk 1993.

Methods	Cross‐over study, interventions given in random order.
Participants	12 patients with CF, gender split not stated. Age and disease severity also not reported.
Interventions	FET, postural drainage. FET, PEP breathing. Control.
Outcomes	Radioactive tracer clearance.
Notes	Measurements 30 minutes, 1 hour, 2 hours and 24 hours after intervention.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Paper states random order of the interventions, but no details of randomisation method given.
Allocation concealment (selection bias)	Unclear risk	Not discussed.
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Interventions did not allow participants or clinicians to be blinded, not discussed whether outcome assessors were blinded.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No mention of any dropouts.
Selective reporting (reporting bias)	Unclear risk	Protocol not available for comparison and insufficient information to assess whether all outcomes reported.
Other bias	Unclear risk	Funding source not reported, however potential sources not thought to introduce a significant risk of introducing bias. Unknown whether patients naive to all interventions prior to study.