Table 2

Internal pilot progression criteria

Criteria	Green (go)	Amber (review)	Red (stop)
Centre recruitment: Centres open within 12 months of starting centre recruitment (including data up to the end of month 19). A centre will be defined as open if it has been randomised and is open to recruitment.	≥54	42–53	<42
Parent recruitment: Average number of parents recruited per programme/equivalent (including data up to the end of month 23, allowing for 6 months of parent recruitment).	≥4	3–<4	<3
HENRY programme delivery: Percentage of intervention centres having started delivery of at least one programme (including data up to the end of month 27, allowing for 18 months from starting centre recruitment). The denominator will include all centres allocated to the intervention arm. The numerator will be all of those intervention centres that have started to deliver at least one programme, defined as delivering at least one session to parents.	≥80%	50%–80%	<50%