Exploration of a cultural-adaptation of the EQ-5D for Thai population: A “bolt-on” experiment

Purpose As the EQ-5D was developed in western countries with only five dimensions, it might be insensitive to non-western populations including Thai. This study examined the impact of adding two candidate dimensions, “interpersonal relationships (IR)” and “activities related to bending knees (AK),” to the EQ-5D questionnaire, and evaluated their psychometric properties in a Thai population sample.