Table 1.

Definition and criteria of the engagement groups

Engagement Group	Definition
Non-initiator	Enrol into a MoreLife programme but do not attend any sessions.
Initiator	Attend the first third of the programme only.
Late dropout	Attend the first and second third of the programme only.
Low sporadic attender	Attend <50 % of all sessions across the programme. Must attend at least one session in the middle and last third of the programme.
High sporadic attender	Attend between 50-70 % of sessions across all programme.
Completer	Attend ≥70 % of all sessions. Seventy percent was selected as it falls between the completion criterion recommended by the National Obesity Observatory [38] (75 %) and the Department of Health [39] (60 %).