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Ceiling effects in the Movement Assessment Battery for Children-2 (MABC-2) suggest that non-parametric scoring methods are required

French, Blandine; Sycamore, Nicole J.; McGlashan, Hannah L.; Blanchard, Caroline C.V.; Holmes, Nicholas P.

Authors

Blandine French Blandine.French@nottingham.ac.uk

Nicole J. Sycamore

Hannah L. McGlashan



Abstract

Initially designed to identify children's movement impairments in clinical settings, the Movement Assessment Battery for Children-2 (MABC-2) is also widely used to evaluate children's movement in research. Standardised scores on the test are calculated using parametric methods under the assumption of normally-distributed data. In a pilot study with thirty five 8-10 year old children (i.e., in Age Band 2 of the MABC-2), we found that maximal performance was often reached. These ‘ceiling effects’ created distributions of scores that may violate parametric assumptions. Tests of normality, skew, and goodness-of-fit revealed this violation, most clearly on three of the eight sub-tests. A strong deviation from normality was again observed in a sample of 161 children (8-10 years, Experiment 1), however ceiling effects were reduced by modifying the scoring methods, and administering items designed for older children when maximal performance was reached. Experiment 2 (n=81, 7-10 years) further refined the administration and scoring methods, and again improved the distributions of scores. Despite reducing ceiling effects, scores remained non-parametrically distributed, justifying non-parametric analytic approaches. By randomly and repeatedly resampling from the raw data, we generated non-parametric reference distributions for assigning percentiles to each child's performance, and compared the results with the standardised scores. Distributions of scores obtained with both parametric and non-parametric methods were skewed, and the methods resulted in different rankings of the same data. Overall, we demonstrate that some MABC-2 item scores are not normally-distributed, and violate parametric assumptions. Changes in administering and scoring may partially address these issues. We propose that resampling or other non-parametric methods are required to create new reference distributions to which an individual child's performance can be referred. The modifications we propose are preliminary, but the implication is that a new standardisation is required to deal with the non-parametric data acquired with the MABC-2 performance test.

Citation

French, B., Sycamore, N. J., McGlashan, H. L., Blanchard, C. C., & Holmes, N. P. (in press). Ceiling effects in the Movement Assessment Battery for Children-2 (MABC-2) suggest that non-parametric scoring methods are required. PLoS ONE, 13(6), https://doi.org/10.1371/journal.pone.0198426

Journal Article Type Article
Acceptance Date May 25, 2018
Online Publication Date Jun 1, 2018
Deposit Date May 29, 2018
Publicly Available Date Jun 1, 2018
Journal PLoS ONE
Electronic ISSN 1932-6203
Publisher Public Library of Science
Peer Reviewed Peer Reviewed
Volume 13
Issue 6
Article Number e0198426
DOI https://doi.org/10.1371/journal.pone.0198426
Keywords Methods, movement, children, nonparametric, assessment
Public URL http://eprints.nottingham.ac.uk/id/eprint/52046
Publisher URL http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0198426
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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