RESUMO
Objective[s]: To assess the reliability and validity of the Q-LES-QSF in Iran
Methods: The Q-LES-QSF includes 14 items. Each item was graded in 1-5 scale, and total score was converted to maximal percentage. This scale English version was translated to Persian through back and forward method. Demographic data questionnaire, one item life satisfaction scale and SWLS were also used. The samples were selected using random stratified method in Kashan Nursing and Midwifery Faculty [n=161].Reliability was determined via internal consistency [Item total Correlation, Cronbach's alpha, and split-half] and stability [test re-test]. Validity was determined via Criterion-Related validity [Concurrent V] and Construct Validity [Known-groups approach]. The data were analyzed using Pearson correlation coefficient, Intraclass correlation coefficient, Equal-Length spearman-brown, Guttman and independent t-test by SPSS-11
Results: In 0-100 scale, Subjective well-being score was 57.04+/-19.17. The questionnaire reliability coefficient was 0.93-0.96. Item-total correlation and test re-test confirmed its reliability too. Its concurrent validity with SWLS [r=0.71, P<0.0001] and one item life satisfaction scale[r=0.78, P<0.0001] was confirmed. The known-groups approach also revealed this tool is valid [P<0.0001]
Conclusion: The Q-LES-QSF Persian version for evaluation of subjective well-being in the university students is valid and reliable. It's suggested after the revision in the question of "satisfaction with sexual activity or interests "more studies are carried out
RESUMO
To assess the reliability and validity of the 13 item Life Satisfachtion Index-Z [LSI-Z] questionnaire in Kashan, Iran. The 13 item LSI- Z English version was translated into Persian through forward-backward method. Another questionnaire including demographic data and a question about overal life satisfaction status was also used .The sampling was performed using convenience method. All of the people aged >60 years old who had conferred to two health centers in kashan [a city in central part of Iran] [n=75] were selected. After their consent informed, the questionnaires were completed through interviews. Reliability was determined via internal consistency [cronbach's alpha, split-half] and stability [test re-test]. Construct validity was determined through known-groups comparison. The data were analyzed using Pearson correlation coefficient, Intraclass correlation coefficient, unequal spearman brown, Guttman, Cronbach's alpha coefficient and oneway ANOVA. The life satisfaction score was 13.68 +/- 5.47 [from possible score ranging from 0 to 26]. The questionnaire reliability coefficient [internal consistency] was 0.78-0.79. Item-total correlation and test-retest confirmed its reliability too .LSI-Z scores were significantly different among the 5 known- groups [P=0.0001, f= 121.66]; so the known-groups approach revealed that this tool is valid. The 13 item LSI-Z Persian version for evaluation of life satisfaction in Iranian elderly people is valid and reliable