Pike 1999

Methods	RCT. Cross‐over design (no washout period). Location: single centre in UK. Duration: 2 days of treatment and measurements taken at end.
Participants	21 participants (12 males, 9 females). Median age 26 years.
Interventions	Flutter and forced expiration versus ACBT. First treatment was performed 2x on Day 1 and then the other treatment 2x the following day.
Outcomes	RFTs, sputum weight, oxygen saturations and participant satisfaction were the outcome measures.
Notes	Abstract only, no full paper as yet published. Cross‐over paired T‐test and McNemars Chi² tests were used for statistical analysis.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Described as randomised but method not discussed.
Allocation concealment (selection bias)	Unclear risk	Not discussed.
Blinding (performance bias and detection bias) All outcomes	Low risk	Independent observer measured pulmonary function and oxygen saturations.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No dropouts identified or discussed.
Selective reporting (reporting bias)	Unclear risk	Not discussed.
Other bias	Unclear risk	Abstract only.