title: Psychometric properties of the Social Cognitive Theory questionnaire for physical activity in a sample of Iranian adolescent girl students.
abstract: This research examined the validity and reliability of a researcher-developed questionnaire based on Social Cognitive Theory (SCT) to assess the physical activity behaviour of Iranian adolescent girls (SCT-PAIAGS). Psychometric properties of the SCT-PAIAGS were assessed by determining its face validity, content and construct validity as well as its reliability. In order to evaluate factor structure, cross-sectional research was conducted on 400 high-school girls in Tehran. Content validity index, content validity ratio and impact score for the SCT-PAIAGS varied between 0.97-1, 0.91-1 and 4.6-4.9 respectively. Confirmatory factor analysis approved a six-factor structure comprising self-efficacy, self-regulation, family support, friend support, outcome expectancy and self-efficacy to overcoming impediments. Factor loadings, t-values and fit indices showed that the SCT model was fitted to the data. Cronbach's α-coefficient ranged from 0.78 to 0.85 and intraclass correlation coefficient from 0.73 to 0.90.
authors.affiliation: Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
authors.forename: M S
authors.initials: MS
authors.lastname: Ardestani
authors.affiliation: Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
authors.forename: S
authors.initials: S
authors.lastname: Niknami
authors.affiliation: Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
authors.forename: A
authors.initials: A
authors.lastname: Hidarnia
authors.affiliation: Department of Biostatistics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
authors.forename: E
authors.initials: E
authors.lastname: Hajizadeh
mesh_terms: D000293:Adolescent; D003071:Cognition; D005260:Female; D006801:Humans; D007492:Iran; D011582:Psychological Theory; D011594:Psychometrics; D013334:Students / Q000523:psychology*; D011795:Surveys and Questionnaires