Reliability and Construct Validity of the Malay Version of Theory of Planned Behaviour (TPB) for Smoking Cessation

• Published in: Asian Pacific journal of cancer prevention : APJCP Vol. 19; no. 10; pp. 2815 - 2820
• Main Authors: Ruslan, Nur-Hasanah, Yasin, Siti Munira, Isa, Mohamad Rodi, Mohd Nasir, Nadzimah, Ahing, Theresa, Rajikin, Mohd Hamim
• Format: Journal Article
• Language: English
• Published: Thailand West Asia Organization for Cancer Prevention 26.10.2018
• Subjects: Correlation of Data; Cross-Sectional Studies; Factor Analysis, Statistical; Humans; Intention; Malaysia; Male; Psychological Theory; Psychometrics - methods; Reproducibility of Results; Smoking - adverse effects; Smoking Cessation - methods; Surveys and Questionnaires; Translations; Malaysia; translation; Theory of planned behavior; validation; smoking
• ISSN: 1513-7368; 2476-762X
• DOI: 10.22034/APJCP.2018.19.10.2815

Objective: The aim of this study was to evaluate the psychometric properties of the Malay translated version of the Theory of Planned Behavior (TPB) intention to quit smoking questionnaire. Methods: A cross-sectional study was performed involving 185 male smokers. The forward-backward translation procedure was adopted to translate the questionnaire from English to Malay. The internal consistency and stability were assessed using Cronbach’s alpha and a correlation analysis and Exploratory Factor Analysis was conducted. Result: The translated questionnaire showed good internal consistency with Cronbach’s alpha values of 0.86, 0.64, 0.74 and 0.90 for each of the four respective factors. The test-retest reliability revealed acceptable stability, with Spearman’s correlation coefficients ranging from low to moderate (r>0.30-0.50) and a satisfactory inter class correlation coefficient (ICCs). The construct validity achieved an acceptable factor loading for each construct which ranged from 0.40 to 0.90. Conclusion: The current study provided psychometric evidence for an appropriate, reliable and valid tool of TPB Malay version. This questionnaire could be applied in evaluating smoking cessation interventions in Malaysia.