Table 1.

Definitions of adherence

	Definition	Acceptable values	Target values
Individual sessions	To ‘complete’ an individual session participant must…	Enter responses on at least 20 out of 40 trials (50%)	Enter responses on at least 30 out of 40 trials (75%)
Intervention overall	To ‘complete’ the intervention participants must…	Complete ¼ of all sessions scheduled to date	Complete ½ of all sessions scheduled to date
Number of participants	Proportion of sample to be adherent to meet overall trial adherence targets	50%	75%