We read with great interest the systematic review by Thome et al¹ on the elective use of high frequency ventilation compared with conventional mechanical ventilation in preterm infants. Thome et al included 17 randomised trials and stated that, unlike previous meta-analyses, they did not find significant benefits in pulmonary outcome. They also referred to our published cumulative meta-analysis.² However, we would like to point to the fact that, in our meta-analysis, we reported the same finding, but we restricted …