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Introduction: The aim of this survey was to assess psychometric properties of GHQ-28 in Iranian psychiatric population and appropriating it as a screening instrument for assessing general health in this population. Method and Materials: This was a psychometric study executed on 80 psychiatric patients and 80 matched normal participants. The assessments consisted of a psychiatrist’s interview based on DSM.IV criteria, and administration of GHQ-28 and a demographic questionnaire. Data was analyzed using factor, discrimination and regression analysis methods, as well as Pearson’s correlation co-efficient, Spearman- Brown’s and Guttmann’s split tests.  Findings: Four factors were extracted from the GHQ-28, of which the first three explained the most percenttage of variance. Clinical cut-off point, sensitivity, specificity and classification error were found to be 24, 0.80, 0.99, 0.10 respectively. Criterion validity Chronbach's alpha and split reliability co-efficient were found to be 0.78, 0.97 and 0.90 respectively.  Discussion: Factor analysis revealed that the four factors which are the basics in this questionnaire have a high internal consistency. The calculated optimal clinical cut-off point for screening general health in Iranian population was 24 which ensure optimal psychometric indices. Coefficients of criterion validity, structural validity and reliability showed that GHQ-28 is one of the most valid instruments for screening general health. 

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Aim and Background: The aim of current study was to investigate the factor structure, reliability, and validity of Parenting Stress Index-Short Form (PSI-SF) among Tehran city's mothers with 7-12 year-old children. Methods and Materials: After translation, back translation and adaptation of instrument, due to normalization this instrument by applied survey design, 468 mothers from those which selected by multiphase cluster sampling method, complete the PSI-SF questionnaire. The data were analyzed by structural equating model using LISREL software. Findings: The results of Cronbach's alpha showed that the reliability quotients for parenting stress and each of subscales of parental distress, parent-child dysfunctional interaction and difficult child were 0.90, 0.80, 0.84, and 0.80 respectively for total sample (these results for mothers of boys were 0.89, 0.80, 0.83, and 0.78 and mothers of girls 0.91, 0.80, 0.84, and 0.80). Test-retest reliability after 18 days showed 0.75 for total score, 0.82 for parental distress, 0.73 for parent-child dysfunctional interaction, and 0.71 for difficult child. Depression anxiety stress scales (DASS) and the child behavior checklist (CBCL) tests were used for evaluating the divergent and convergent. By using factor analysis, we extracted 3 factors (parental distress, parent-child dysfunctional interaction and difficult child). Conclusions: Results of this study showed that PSI-SF has psychometric properties for utilizing in psychological research and clinical diagnosis of mother's parenting stress.

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Aim and Background: Seattle Angina Questionnaire (SAQ) has been designed to measur health-related quality of life (HRQOL) in patients with coronary artery disease (CAD). The psychometric properties of the questionnaire were evaluated in different countries as it was used widely in CAD patient’s quality of life research. The aim of this research was to investigate normalization, reliability and validity of this questionnaire in Iran. Methods and Materials: Two hundred seventy nine patients with CAD were selected by convinience sampling method from Tehran Heart Center and asked to answer SAQ. Findings: Using exploratory factor analysis by principal components analysis and Varimax rotation, six factors were extracted, including physical limitations caused by light activity, physical limitations caused by heavy activity, treatment satisfaction, quality of life, the problem of angina and chest tightness, and obligation in taking medication. These factors explained 66.16% of items variance. In confirmatory factor analysis, the six-factor model of this questionnaire in Iranian population was more desirable than the five-factor model of the original scale. Cronbach’s alpha of this questionnaire was 0.77 showing an acceptable internal consistency. According to score distribution and T score, mean HRQOL score was about 61 in CAD patients with the cut off point of 82. Conclusions: SAQ is a valid and reliable instrument for assessing health related quality of life of patients with CAD, therefore it can be used in research and clinical settings in Iran.