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The construct and concurrent validity of brief standing sway assessments in children with and without cerebral palsy
Journal article   Open access   Peer reviewed

The construct and concurrent validity of brief standing sway assessments in children with and without cerebral palsy

James B. Tracy, Drew A. Petersen, Benjamin C. Conner, Justus G. Matteson, De’Shjuan G. Triplett, Henry G. Wright, Christopher M. Modlesky, Freeman Miller, Curtis L. Johnson and Jeremy R. Crenshaw
Gait & posture, v 84, pp 293-299
Feb 2021
DOI: https://doi.org/10.1016/j.gaitpost.2020.12.013
PMID: 33421952
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7902400View
Accepted (AM)Open Access (License Unspecified),  Open

Abstract

Balance Center of pressure Fidgeting Postural control Stability Validity
•Eyes opened and closed postural sway of children with and without CP for 30 s.•We evaluated construct and concurrent validity at shorter durations (5−25 s).•Construct validity (effect size) maintained for seven shorter duration measures.•Concurrent validity (correlation) maintained for those shorter duration measures.•Shorter durations may be more feasible for groups with difficulty standing quietly. Standing postural sway is often quantified from center of pressure trajectories. During assessments of longer durations, children may fidget, thus limiting the feasibility and validity of sway recordings. Do postural sway sample durations less than 30 s maintain construct and concurrent validity? In this case-control, observational study, we measured postural sway in 41 children (age 5–12 years, 23 typically developing (TD); 18 with spastic cerebral palsy (CP), 13 diplegic and 5 hemiplegic, 11 GMFCS level I and 7 level II) for 30-second eyes-opened and eyes-closed conditions. From a single recording, 5-second incremental durations of 5−30 s were considered in this analysis. We quantified anteroposterior, mediolateral, and transverse-plane sway using seven time-domain variables: root-mean-square error, total excursion, mean frequency, mean distance, sway area, and 95 % confidence circle and ellipse areas. Variables were calculated in eyes-opened and eyes-closed conditions, as well as the ratio of the two. Construct validity was evaluated by the persistence of large effect sizes (Glass’s Δ ≥ 0.80) between CP and TD participants at shorter durations than 30 s. Concurrent validity was evaluated by the correlations of shorter duration measures to the 30 s measure. Seven sway measures had large between-group effects (Glass’s Δ ≥ 1.02) for the 30 s measure that persisted (Glass’s Δ ≥ 0.81) at shorter durations (5−25 s) and also maintained concurrent validity (r ≥ 0.83). Six of these seven measures were taken in the eyes-closed condition, and all seven measures were in the mediolateral direction or transverse plane. Our analysis suggests that sway durations less than 30 s can uphold construct and concurrent validity. These measures were primarily in the eyes-closed conditions and mediolateral direction. These results are a promising indicator that shorter-duration sway measures may be of utility when fidgeting prevents longer recordings.

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8 citations in Web of Science
7 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Neurosciences
Orthopedics
Sport Sciences
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