Abstract
Context
Health-related quality of life is a preferred outcome measure for patients with advanced liver disease. The functional health status charts developed by the Dartmouth Primary Care Cooperative Information Project (COOP)/World Organization of National Colleges, Academies and Academic Associations (WONCA) make up a generic instrument for assessing health-related quality of life.
Objective
To translate and validate the Persian version of COOP/WONCA in liver transplant candidates and to assess the correlation of Child Pugh classification and Model of End Stage Liver Disease (MELD) score with quality of life.
Setting
The Shiraz liver transplant center, the most active liver transplant center in the Middle East.
Participants
Consecutive adult outpatients waiting for their first liver transplant who attended follow-up visits in the pretransplant clinic.
Main Outcome Measures
Patients completed COOP/WONCA along with the Short Form (SF)-36. Data on the underlying cause of cirrhosis, Child-Pugh classification, and MELD scores were collected from medical records.
Results
A Persian version of the COOP/WONCA was accepted by liver transplant candidates and showed adequate reliability and validity. Similar domains in COOP/WONCA charts and the SF-36 were highly correlated, indicating that construct validity of the COOP/WONCA in relation to the SF-36 was good (77% of correlations were as expected). Moreover, the exploratory factor analysis could not extract 2 different quality-of-life factors. These findings provide sufficient evidence to conclude that the Persian versions of COOP/WONCA charts and the SF-36 measure the same constructs of health-related quality of life and can be used interchangeably. Four of the 6 COOP/WONCA charts did not allow discrimination between groups of patients according to Child Pugh classification, indicating poor known group validity.