AIM: The aim of the study was to describe the relationship between the childʼs and familyʼs characteristics and the most common treatment modalities in a national population-based sample of 8- to 15-year-old children with cerebral palsy. METHOD: A cross-sectional study, based on the Danish Cerebral Palsy Registry. The parents of 462 children answered a questionnaire about their childʼs treatment and the familyʼs characteristics (living with a single parent, having siblings, living in a city, parental education level). Descriptive and logistic regression analyses were performed for every treatment modality, stratified by Gross Motor Function Classification System (GMFCS) level. RESULTS: An IQ below 85 was associated with weekly therapy in GMFCS level I (adjusted odds ratio [ORadj] 2.5 [CI 1.1–5.7]) and the use of oral spasmolytics in GMFCS levels III to V (ORadj 3.1 [CI 1.3–7.4]). Older children in GMFCS levels III to V used daily orthoses less frequently (ORadj 0.7 [CI 0.6–0.9] per year). Of all of the family characteristics studied, only the parentsʼ education level had significant associations with more than one treatment modality. INTERPRETATION: A childʼs cognitive function showed an impact on treatment of the motor impairment in children 8 to 15 years of age with cerebral palsy. Parental education level may influence the choice of treatment. WHAT THIS PAPER ADDS