Influence of gait analysis on decision-marketing for lower extremity surgery

Measuring self-concept in children with cerebral palsy


  1. 1. University of Wisconsin- La Crosse, La Crosse, WI, USA

Objectives: To cross validate the SelfDescription Questionnaire-I (SDQ-I) for use with children with cerebral palsy (CP) and average intelligence or mild mental retardation (MMR).

Design: Instrument validation study.

Participants: A convenience sample of 104 children with CP between 9 and 16 years of age was recruited through various hospitals, school districts, and recreational organizations in the Philadelphia region. Each child needed to have CP, average intelligence or MMR, and no history of a progressive neurological disorder in conjunction with CP.

Method: The SDQ-I was completed using a format consistent with the needs of each child. Reliability was assessed using Cronbach’s coefficient alpha ( ) for each of the eight sub-scales of the SDQ-I. Construct validity was assessed using factor analysis including scree plot, principal factor analysis (PFA), and structural equation modeling (SEM).

Results: The internal consistency of the SDQ-I was moderate when used with children with CP and average intelligence or MMR. The coefficient    scorces were as follows for the sub-scales of the SDQ-I: physical abilities 0.76, physical appearance 0.85, peer relations 0.84, parent relations 0.80, reading 0.90, math 0.94, general school 0.89, and general self 0.79.These were comparable to the coefficient    values reported for the normative sample in the SDQ-I manual, which had a range of 0.80 to 0.90. Each of the methods for factor analysis indicated that the factors in the instrument when used with children with CP were similar to the factors reported within the SDQ-I manual. The slope of the scree plot curve revealed that there were eight substantive factors in the SDQ-I, representing the eight subscales. PFA showed that the factors correlated more highly with the intended questions than with the non-intended questions on the measure. The SEM, using higher order factor models, revealed that there was significant goodness of fit for each of the models considered.

Conclusions: The SDQ-I appears to be psychometrically stable when used with children with CP and average intelligence or MMR, demonstrating moderate internal consistency and good construct validity; however we are gathering additional validity data in our new project. Our new project investigates the nature of self-concept in children with CP differed from the normative sample of the SDQ-I on several subscales.

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