“…The study of interinformant agreement and factors affecting it remain an important issue in examining children and adolescents. While there are many publications about parent-child agreement on children's quality of life in physical illnesses such as epilepsy [27], asthma [5], cystic fibrosis [11], cancer [20,24,28,29,32], juvenile idiopathic arthritis [2], oral, oro-facial problems [12], there are less in psychiatric illnesses [attention-deficit/ hyperactivity: 3,16] and in general population [6,26,31]. There are only a few that compare ill population to a healthy one in the same study [5,20,28] but their methodology varies greatly, thus making comparison and generalizability difficult.…”