title: Substance use avoidance among Iranian male adolescents: a comparison of three versions of the theory of reasoned action.
abstract: The theory of reasoned action (TRA) is one of the most common models in predicting health-related behaviors and is used more often in health education studies. This study aimed to add two control constructs (perceived behavioral control - PBC and self-efficacy - SE) to the TRA and compare them using the structural equation modeling (SEM) for substance use avoidance among Iranian male adolescents in order to find out which model was a better fit in predicting the intention. This was a cross-sectional study carried out in Tehran, Iran. Data were collected from a random sample of high school male students (15-19 years of age) using a questionnaire containing items related to the TRA plus items reflecting two additional constructs (SE and PBC). In all, 433 students completed the questionnaires. The results obtained from SEM indicated a better fit to the data for the TRA with SE compared to the TPB (TRA with PBC) and TRA (χ2/df=2.55, RMSEA=0.072, CFI=0.96, NFI=0.94, NNFI=0.95, SRMR=0.058). Comparing SE and PBC, the results showed that self-efficacy was a better control construct in improving the TRA and predicting substance use avoidance intention (41%). The TRA with SE had a better model fit than TPB and the original version of the TRA.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Tavousi
authors.forename: Ali
authors.initials: A
authors.lastname: Montazeri
authors.forename: Alireza
authors.initials: A
authors.lastname: Hidarnia
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Hajizadeh
authors.forename: Farhad
authors.initials: F
authors.lastname: Taremian
authors.forename: Aliasghar
authors.initials: A
authors.lastname: Haerimehrizi
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D000328:Adult; D003430:Cross-Sectional Studies; D006801:Humans; D007492:Iran; D008297:Male; D008960:Models, Psychological; D011582:Psychological Theory; D011594:Psychometrics; D020377:Self Efficacy; D000068356:Self-Control; D019966:Substance-Related Disorders / Q000517:prevention & control* / Q000523:psychology*; D011795:Surveys and Questionnaires; D055815:Young Adult