Japanese version of the food allergy quality of life questionnaire 10: An easy-to-use instrument

Background: The health-related quality of life (HRQL) of people with food allergies should be evaluated to provide high-quality medical care. Currently, there is no available easy-to-use and reliable instrument for assessing HRQL clinically in Japan. Methods: The Food Allergy Quality of Life Questionnaire 10 (FAQLQ10) in English was translated into Japanese, and this was referred to as the Japanese version of the Food Allergy Quality of Life Questionnaire 10 (FAQLQ10-J). Participants aged up to 18 years, who had food allergy, and their parents were instructed to complete the FAQLQ10-J and the Food Allergy Independent Measure, a self-report instrument. For comparison, participants without food allergies were also included in the survey. Results: The FAQLQ10-J, which included forms for individuals aged 8–12 years, teenagers, and caregivers was developed. The responders completed each form within approximately 3 min. An analysis of responses showed that each form had a good internal consistency, test–retest reliability, construct validity, and discriminant validity. Moreover, based on an examination of the relationship between demographic data and FAQLQ10-J scores, items such as possession of an adrenaline auto-injector, participant age, and number of eliminated foods might influence HRQL. Conclusions: We developed the FAQLQ10-J, which is a simple, reliable, and effective tool for assessing HRQL among Japanese individuals with food allergy. Its use may provide a more detailed understanding of HRQL among individuals with food allergy in clinical settings and may facilitate the development of more individual-oriented treatments.