Study	Reason for exclusion
Balanzat 2006	Not RCT. Observational study
Cesar 2017	Wrong comparison. Study compared high‐flow nasal canula with CPAP.
Chidini 2011	Wrong intervention. Study compared different methods of CPAP delivery rather than CPAP versus no CPAP.
Chidini 2015	Wrong intervention. Study compared different methods of CPAP delivery rather than CPAP versus no CPAP.
Hough 2011	Wrong intervention. Study compared different levels of CPAP produced by high‐flow nasal prongs.
Javouhey 2008	Not RCT. Retrospective study
Milési 2017	Wrong comparison. Study compared high‐flow nasal canula with CPAP.
Smith 1993	Not RCT. Study compared different levels of peak end expiratory pressure in mechanically ventilated children with bronchiolitis.
Yañez 2008	Wrong intervention. Study evaluated non‐invasive ventilation rather than CPAP.

CPAP: continuous positive airway pressure
 RCT: randomised controlled trial