Crane 1990.

Methods	Cross‐over RCT of prone, supine and right lateral positions
Participants	Included: 19 premature infants mechanically ventilated with intermittent mandatory ventilation and PEEP for clinical hyaline membrane disease Excluded: not stated Mean gestational age: 31 weeks; mean birth weight: 1485 g; age: 20 to 72 hours; mean FiO2: 0.43 Setting: regional NICU, USA
Interventions	Infants remained in study position from 10 to 85 minutes
Outcomes	tcCO2; PaCO2 Measurements were stabilised for 1 to 4 minutes before data were collected
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	High risk	Loss to follow‐up 5/19; data were discarded due to excessive drift or inaccurate or inappropriate calibration of equipment