Validity and reliability of the Turkish version of the Commitment to Quitting Smoking Scale

Objective: The primary aim of this study is to adapt the Commitment to Quitting Smoking Scale (CQSS) to Turkish and to conduct its reliability and validity studies in a Turkish sample.Method: The study involved a total of 314 smokers, comprising 178 (56.7%) women and 136 (43.3%) men, aged between 18 and 65. Statistical analysis included item-total score correlation coefficients, internal consistency coefficient, test-retest reliability, confirmatory factor analysis, criterion-dependent validity, and discriminant validity methods. Results: Confirmatory factor analysis showed that the Turkish version of the CQSS maintains the single-factor structure of the original form (chi 2=35.042, chi 2/df=2.061, Root Mean Square Residual (RMR)=0.035, Comparative Fit Index (CFI)=0.989, Goodness of Fit Index (GFI)=0.974, Root Mean Square Error of Approximation (RMSEA)=0.058). In convergent validity, significant correlations were observed between the CQSS and other measures like the Fagerstrom Test for Nicotine Dependence (FTND) and the Questionnaire of Smoking Urges-Brief (QSU-Brief). For discriminant validity, the 27% lower and upper groups method was used, revealing significant differences in the CQSS scores between participants in these groups. In reliability analysis, the Cronbach's alpha coefficient for the CQSS was found to be 0.91. Test-retest reliability analysis showed a correlation coefficient of 0.71 between two measurements.Conclusion: When considering all the findings, it is evident that the CQSS possesses adequate psychometric properties within the sample of the Turkish-speaking population.