Ennis 1978.

Methods	Cross‐over RCT of supine, left lateral and right lateral positions
Participants	Included: 9 infants with hyaline membrane disease, all receiving assisted ventilation Excluded: not stated Setting: US
Interventions	Infants were placed in each position semi‐erect and also lying flat
Outcomes	PaO2 Measurements commenced 5 to 10 minutes after position change or if intervention required, the mean value was calculated from 4 points, i.e. the start and end of recording and 2 equidistant points between
Notes
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 1/9 because one infant could not be nursed flat at physicians request