Editor,—Thomson’s recent review of negative pressure ventilation1 included results of our randomised controlled trial of 244 infants with neonatal respiratory failure.2 She commented that there was “a small overall benefit of CNEP [continuous negative extrathoracic pressure] but with non-significant increases in mortality, pneumothorax rate, and cranial ultrasound abnormalities in the CNEP group”. An important result not mentioned in her review …