Department of Health Education, Faculty of Medical Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, P,O, Box: 14115-331, Tehran, Iran.
BMC Public Health. 2013 Dec 17;13:1186. doi: 10.1186/1471-2458-13-1186.
The transtheoretical model (TTM) is a common framework for studies of smoking cessation. Using the TTM, several instruments were developed to measure to what extent interventions could make changes in people's behavior. The current study aimed to test the validity and reliability of the Persian version of a TTM based questionnaire for smoking cessation in Iran.
This was a cross-sectional validation study among adult male smokers using the TTM Questionnaire. Backward-forward procedure was applied to translate the questionnaire from English into Persian (the Iranian language). The confirmatory factor analyses were performed to test validity. The internal consistency and stability of the questionnaire was examined using Cronbach's alpha coefficient and Intraclass Correlation Coefficient (ICC).
In all 150 male smokers were entered into the study. The mean age of participants was 36.51 ± 7.94 years. The results obtained from confirmatory factor analysis revealed that the data was fit to the model: the goodness of fit index (GFI) = 0.92; the comparative fit index (CFI) = 0.91; the root mean square error of approximation (RMSEA) = 0.065 (95% CI = 0.063-0.067), and the relative chi-square (x²/df) = 1.87, p < 0.001. The Cronbach's alpha ranged from 0.60 to 0.84 indicating an acceptable result. Also Intraclass Correlation of Coefficient (ICC) ranged from 0.61 to 0.83 corresponding to a satisfactory finding.
The current study provided psychometric evidence for an appropriate, reliable, and valid tool to determine smoking behaviors among Iranian adult smokers. Indeed the findings from this study could be applied in designing smoking cessation interventions in Iran.
跨理论模型（TTM）是研究戒烟的常用框架。使用 TTM，开发了几种工具来衡量干预措施在多大程度上可以改变人们的行为。本研究旨在检验基于 TTM 的问卷的波斯语版本在伊朗用于戒烟的有效性和可靠性。
这是一项使用 TTM 问卷的横断面验证研究，对象为成年男性吸烟者。采用前后翻译程序将问卷从英语翻译成波斯语（伊朗语）。通过验证性因子分析来检验有效性。使用 Cronbach's alpha 系数和组内相关系数（ICC）来检验问卷的内部一致性和稳定性。
共有 150 名男性吸烟者参与了这项研究。参与者的平均年龄为 36.51±7.94 岁。验证性因子分析的结果表明，数据与模型拟合良好：拟合优度指数（GFI）=0.92；比较拟合指数（CFI）=0.91；近似均方根误差（RMSEA）=0.065（95%CI=0.063-0.067），相对卡方（x²/df）=1.87，p<0.001。Cronbach's alpha 范围在 0.60 到 0.84 之间，表明结果可以接受。组内相关系数（ICC）的范围在 0.61 到 0.83 之间，对应于令人满意的发现。
本研究提供了在伊朗成年吸烟者中确定吸烟行为的适当、可靠和有效的工具的心理测量证据。事实上，这项研究的结果可用于在伊朗设计戒烟干预措施。
