J Med Assoc Thai 2000; 83 (11):130

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Reliability of Thai Version of SF -36 Questionnaire for the Evaluation of Quality of Life in Cardiac Patients
Krittayaphong R Mail, Bhuripanyo K , Raungratanaampom O , Chotinaiwatarakul C , Chaowalit N , Punlee K , Kangkagate C , Chaithiraphan S

Quality of life is an important measurement of medical outcomes. Reliability of a Thai
version of the SF-36 questionnaire has never been reported. The objective of this study was to
determine the reliability of a Thai version of the SF-36 questionnaire in cardiac patients. We
developed a Thai version of the SF-36 questionnaire and tested it in 212 cardiac patients. Reli-
ability of the Thai version of the SF-36 questionnaire was assessed by internal consistency using
Cronbach' s Alpha statistic and inter-item correlation.
We demonstrated that Cronbach's Alpha coefficient of every aspect of QOL exceeded
0.7, and all inter-item correlation exceeded 0.4. In conclusion, the Thai version of the SF-36 ques-
tionnaire is a valuable tool in assessing medical outcomes and medical research in Thai patients
with cardiac disease. Whether it can be used in other diseases remains unknown.
Key word : Reliability, SF-36 Questionnaire, Quality of Life

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