“…In total, 21 studies included explicit definitions of engagement (Supplemental Appendix B). Several studies defined engagement as a unidimensional construct such as attendance (Corso et al, 2010;Smith et al, 2018), the number of sessions completed (Baggett et al, 2017), homework compliance (Pavuluri et al, 2021), retention (Folger et al, 2016), "the actual receipt of a visit" (McCurdy et al, 2006(McCurdy et al, , p. 1198, and "receipt of a high dose of visits" (McFarlane et al, 2010, p. 541) defined as greater than 75% of expected visits (McFarlane et al, 2010). Others operationalized engagement as multidimensional constructs encompassing the cognitive, affective, attitudinal, and behavioral domains (Byrnes et al, 2010;Coatsworth et al, 2018;Schoenfelder et al, 2013).…”