title: Measuring mobility limitations in children with cerebral palsy: development, scalability, unidimensionality, and internal consistency of the mobility questionnaire, MobQues47.
abstract: OBJECTIVE
  To develop a questionnaire that specifically and comprehensively measures mobility limitations in children with cerebral palsy (CP) and to investigate certain psychometric properties (scalability, unidimensionality, internal consistency) of this questionnaire.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Private physical therapy practices and outpatient departments of hospitals and rehabilitation centers.
  
  
  METHODS
  Children with CP undergoing physical therapy or rehabilitation. The Mobility Questionnaire, 47-item (MobQues47), was completed by the mothers of these children (N=323; mean age +/- SD, 7.1+/-2.9y; 57% boys; Gross Motor Function Classification levels: I [48%], II [26%], III [19%], IV [7%]).
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Mokken scale analysis was used to investigate (1) scalability, indicating that the items form a scale; (2) unidimensionality, indicating that the items measure only 1 concept; and (3) internal consistency, indicating the degree of interrelatedness of the items.
  
  
  RESULTS
  The MobQues47, made up of 47 items, was developed on the basis of 3 pilot studies and careful operationalization of the concept (or construct) of mobility limitations. The scalability (coefficient H=.70), unidimensionality, and internal consistency (coefficient rho=.99) of the MobQues47 were found to be very good.
  
  
  CONCLUSIONS
  The MobQues47 is a unidimensional scale with excellent internal consistency that can be used to measure caregiver-reported mobility limitations in children with CP.
authors.affiliation: Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands. l.roorda@janvanbreemen.nl
authors.forename: Leo D
authors.initials: LD
authors.lastname: Roorda
authors.forename: Vanessa A
authors.initials: VA
authors.lastname: Scholtes
authors.forename: Johanna H
authors.initials: JH
authors.lastname: van der Lee
authors.forename: Jules
authors.initials: J
authors.lastname: Becher
authors.forename: Annet J
authors.initials: AJ
authors.lastname: Dallmeijer
mesh_terms: D000203:Activities of Daily Living; D000293:Adolescent; D002547:Cerebral Palsy / Q000150:complications* / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D051346:Mobility Limitation; D026741:Physical Therapy Modalities; D011594:Psychometrics; D015203:Reproducibility of Results