Iranian Journal of

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  Background & Objectives : Leadership power and management are discussed as sensitive and key elements in the safety issue. A safety leader can provide the necessary incentives for hard work, efficiency, and more productivity in the organization which includes various working groups and also strengthening a sense of individual responsibility to promote the safety performance in order to achieve the organizational goals. This study aimed to determine the validity and reliability of the Safety Leadership Questionnaire in the vehicle manufacturing industry.

  Methods : This cross-sectional study was conducted on 260 employees of Pars-Khodro Company in the manufacturing lines. All samples were selected randomly. The validity of the questionnaire was determined by statistical methods such as exploratory factor analysis, confirmatory factor analysis, and the heterogeneity between questions. Also, the Cronbach's alpha was used in order to investigate the reliability of the questionnaire.

  Results: The results of exploratory factor analysis showed three factors including decision making, control, and incentives explained 66 percent of the total variance. Confirmatory factor analysis represented the appropriate fitness of information with a three-component structure (P<0.001, df = 2, 𝜒 2 = 5.36, CFI = 0.957, RMSEA = 0.089). The Cronbach's alpha coefficient was higher than 0.7 for all three factors.

  Conclusion : In this research, decision making was an important factor in measuring safety leadership. Moreover, the present study represented an indicator which could be used in the other surveys of safety and industrial psychology.

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Background and Objectives: The effect of heart diseases on the quality of life is the issue needs attention of health care providers. Improving quality of life is considered as the goals of rehabilitative therapies. This study conducted to evaluate the McGill Quality of Life Questionnaire in patients with heart diseases.
Methods: In this cross-sectional study, 500 patients with heart diseases were recruited from BooAli Sina Hospital and Velayat Hospital affiliated with Qazvin University of Medical Sciences from May to August 2016. The participants completed the McGill Quality of Life Questionnaire. The construct validity (including convergent and discriminant validity) and Reliability using the Cronbach’s alpha, theta, and McDonald's Omega of the McGill Quality of Life Questionnaire were evaluated. The structure of the Questionnaire was assessed using factor analysis.
Results: Three factors, including overall view of the quality of life, physical aspect, and psychological dimension, were extracted. Model fit indexes confirmed a good fit of he McGill Quality of Life Questionnaire (Comparative of Fit Index: CFI=.918, incremental fit index: IFI=.919, Adjusted Goodness of Fit Index: AGFI=.844, RMSEA=.079, Minimum Discrepancy Function by Degrees of Freedom divided: CMIN/DF=2.97, Parsimonious Normed Fit Index: PNFI=.681, Parsimonious Comparative Fit Index: PCFI=.709). Convergent and divergent validity, internal consistency, and construct reliability of the questionnaire were confirmed.
Conclusion: The findings revealed that the three-factor model of the McGill Quality of Life Questionnaire has satisfactory validity and reliability. Thus, this questionnaire can be used in future studies to assess the quality of life of patients with heart diseases.

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Background and Objectives: The Problematic Internet Use Questionnaire (PIUQ) is a scale for evaluating the adverse effects of high Internet usage. It was adopted into Persian in a previous study. The factorial structure of the adopted version was different from the original English version. The purpose of this study was to determine the factorial structure of the Persian version of the Problematic Internet Use Questionnaire.
 
Methods: In this methodologic study, sampling was carried out in students of Iran University of Medical Sciences, University of Tehran, and Sharif University of Science and Technology. A total of 428 students completed the Problematic Internet Use Questionnaire. Exploratory factor analysis was performed using SPSS. Confirmatory factor analysis was carried out using AMOS. The reliability of the Scale was determined using Cronbach’s alpha coefficient (α=0.89).
 
Results: Exploratory factor analysis showed four factors including online preoccupation, adverse effects, social interactions, and excessive use. The mean ± SD of the domains was 2.12±0.81, 2.01±0.86, 2.18±0.85 and 2.39±0.97 for online preoccupation, adverse effects, social interactions, and excessive use, respectively.
 
Conclusion: The exploratory and confirmatory factor analysis showed that the Persian version of the Problematic Internet Use Questionnaire had a relatively similar structure with the English version. One dimension of the questionnaire was split to two new dimensions. This questionnaire can be a useful tool for measuring problematic behaviors related to the excessive use of the Internet.