Premium
Psychometric properties of the “Autonomous and Controlled Motivation for Treatment Questionnaire” in women with eating disorders
Author(s) -
Sansfaçon Jeanne,
Fletcher Émilie,
Zuroff David C.,
Schmitz Norbert,
Miller Alexia,
Israel Mimi,
Steiger Howard
Publication year - 2019
Publication title -
european eating disorders review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.511
H-Index - 67
eISSN - 1099-0968
pISSN - 1072-4133
DOI - 10.1002/erv.2656
Subject(s) - convergent validity , psychology , eating disorders , reliability (semiconductor) , clinical psychology , predictive validity , test (biology) , validity , psychometrics , internal consistency , paleontology , power (physics) , physics , quantum mechanics , biology
Objective To validate the Autonomous and Controlled Motivation for Treatment Questionnaire (ACMTQ) for use in women with an eating disorder (ED). Method Data were available for 463 individuals. We assessed factor structure, internal reliability, test–retest reliability, convergent/divergent validity, and incremental predictive validity. Results Our data showed acceptable fit to our hypothesized model (comparative fit index = 0.92, root mean square error of approximation = 0.09, standardized root mean square residual = 0.09). We found test–retest reliability of 0.73 for both the autonomous ( α = 0.85) and controlled ( α = 0.80) subscales. Autonomous scores were more strongly associated with motivation measures ( β = 0.37; 0.46) than with ED severity measures ( β = −0.10; −0.18). Associations between autonomous motivation and symptom improvement over time supported predictive validity. Controlled motivation was associated with lower motivation ( β = 0.02; −0.31) and with higher ED severity ( β = 0.12; 0.47). Conclusion Our results suggest that the ACMTQ is valid for use in women with EDs and lend support to the validity of findings from previous ED studies that have used the ACMTQ.