BACKGROUND: In children and adolescents, the prevalence of chronic diseases, e.g., obesity, asthma, and attention-deficit/hyperactivity disorder (ADHD), has increased in the last decades. These diseases have negative effects on patients and their families and pose a significant economic burden. Indirect costs related to caregivers’ lost workdays or children’s and adolescents’ missed education are likely to be high. However, there are no guidelines for measuring and valuing indirect costs in this…