TABLE 1.

Feasibility objectives with pre-specified thresholds for progression to a full randomised controlled trial

Feasibility objective	Feasibility outcome measure	Threshold
Evaluate enrolment rates	Proportion of eligible children who were enrolled (i.e. randomised)	50%
Evaluate deferred consent rates	Proportion of children with signed deferred consent amongst those enrolled into the study	70%
Assess feasibility of recording candidate primary outcome measures	Proportion of data collection complete per participant, for the two candidate primary outcome measures	80%