psychometric properties of the persian version of the quality of life in early old age (casp- 19)

Background: today, improving the quality of life for the elderly is of great importance. in addition, creating a favorable environment for the elderly has become a common concern worldwide. objectives: the aim of this study was to assess the psychometric properties of the persian version of quality of life (casp- 19) in older people. methods: the study included 200 participants. the casp-19 quality of life instrument for older people was adapted to persian language through a translation and translation-back procedure. afterwards, the reliability (internal consistency and test-retest) and validity (including face validity, content validity, factor analysis, known groups, and criterion validity), through assessing the correlation between the persian version of the casp-19 and the sf-36, were measured. results: based on internal consistency (cronbach > s α), the reliability for casp-19 was 0.97 and for the four subscales varied from 0.93 to 0.97. test-retest reliability (pearson’s correlation coefficient) for the farsi version of the casp-19 ranged from 0.87 to 0.94. evaluation of discriminant validity indicated the discriminant power of the casp-19 in terms of the presence or absence of curtailment of personal autonomy. criterion validity indicated a significant correlation between many dimensions of the casp-19 and the sf-36. conclusions: this study confirmed the validity of the casp-19 in terms of construct, convergent, known groups, and face validity. besides, it showed an acceptable internal consistency. the casp-19 is valid for investigating the needs of the iranian elderly.