Cross-cultural adaptation and psychometric evaluation of the Childhood Health Assessment Questionnaire (CHAQ) and the Child Health Questionnaire (CHQ) in 32 countries. Review of the general methodology

The aim of this project was to cross-culturally adapt and validate the American English version of the Childhood Health Assessment Questionnaire (CHAQ) and of the Child Health Questionnaire (CHQ) in the 32 different member countries of the Paediatric Rheumatology International Trials Organisation (PRINTO). This effort farms part of an international stud), supported by the European Union to evaluate the health-elated quality of life in children with Juvenile idiopathic arthritis (JIA) as compared to their healthy peers.A total of 6,644 subjects were enrolled from 32 countries: Argentina, Austria, Belgium, Brazil, Bulgaria, Chile, Croatia, the Czech Republic. Denmark, Finland, France, Georgia, Germany, Greece, Hungary. Israel, Italy, Korea, Latria, Mexico, the Netherlands, Norway, Poland, Portugal, Russia, Slovakia, Spain, Sweden, Switzerland, Turkey, the United Kingdom, and Yugoslavia. A total of 3,235 patients had RA (20% systemic onset, 33% polyarticular onset, 17% extended oligoartic...