Kornecki 2001.

Study characteristics
Methods	Cross‐over RCT of prone and supine positions
Participants	Included: 10 children aged 8 weeks to 16 years who required mechanical ventilation for moderate to severe acute respiratory failure Excluded: not stated Mean age: 5 years; mean weight: 22.5 kg; diagnosis: sepsis/acute respiratory distress syndrome (4), pneumonia (3), other (3) Setting: 36‐bed paediatric critical care unit in a tertiary care university‐based children's hospital in the USA
Interventions	Supine first, then random order of first study position; 12 hours in each position
Outcomes	Oxygenation index Data collected at 2, 4, 6, 8, 12 hours for each position
Notes	Heart rate, PaCO2 and arterial BP were not reported The study was supported by the Department of Critical Care Medicine, Division of Respiratory Medicine, Hospital for Sick Children, University of Toronto, Toronto, Ontario.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not stated
Allocation concealment (selection bias)	Unclear risk	Not stated
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Loss to follow‐up: 2/12 patients were not enrolled because they could not be placed in prone position due to physical restrictions