Missing data in physiotherapists’ assessments of children with cerebral palsy

Abstract

Aims: The aim of this study was to investigate the extent and pattern of internal missing data in physiotherapy assessments of children with cerebral palsy (CP), regarding passive range of motion (PROM) and spasticity (measured using the modified Ashworth scale, MAS). Methodology: Data from 2936 children were included. Extent and pattern of missing data of PROM and MAS were related to Gross Motor Function Classification System (GMFCS) level, CP subtype, age and gender. The material was divided into groups and the proportions of the different variables were compared. Chi-squared statistics were used to assess differences in proportions. Major findings: The extent of missing data of PROM and MAS was small (6.2%). The frequency of missing data of MAS was larger than for PROM and varied according to GMFCS level and age. Principal conclusion: The extent of missing data in this study can be considered small and thus would not influence the generalizability of findings for PROM and MAS. It is, however, advisable to report the degree of missing data, especially if data concern PROM and MAS from children GMFCS level I, GMFCS level III, children from the age group 1–5 years and adolescents aged 13–20 years.