Authors
Abstract
Background: Various studies all over the world have found support for the predictive validity of the theory of planned behavior with respect to smoking. In the absence of a valid and reliable theory of planned behavior (TPB) questionnaire for tobacco use in Iran, the purpose of this study was to design and assess the validity and reliability of the tobacco use theory of planned behavior scale in Iranian male adolescents. Materials and methods: Four hundred and seven students, aged between 14 and 19 years, served as the subjects of this study. They were selected through multi-stage random sampling. A questionnaire was designed based on Ajzen’s advice. The reliability coefficients were calculated by two different methods: Cronbach alpha and test-retest. Also, in order to determine the validity of the scale, we used three methods, including face validity, content validity, and construct validity. Results: Factor analysis showed that TPB consisted of 4 components (attitude, perceived control behavior, subjective norms, and intention), which explained 61% of common variance. Results show the total test-retest reliability and internal consistency to be 0.84 and 0.86, respectively. Confirmatory factor analysis results show that the four-factor model of TPB fits the Iranian sample. Conclusion: The validity and reliability of the Persian version of the tobacco use TPB scale were acceptable and suitable.
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