1. The construct and concurrent validity of brief standing sway assessments in children with and without cerebral palsy.
- Author
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Tracy, James B., Petersen, Drew A., Conner, Benjamin C., Matteson, Justus G., Triplett, De'Shjuan G., Wright, Henry G., Modlesky, Christopher M., Miller, Freeman, Johnson, Curtis L., and Crenshaw, Jeremy R.
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CEREBRAL palsy , *STANDARD deviations , *POSTURE , *EYE , *FIDGETING , *RESEARCH , *POSTURAL balance , *RESEARCH methodology , *CASE-control method , *MEDICAL cooperation , *EVALUATION research , *COMPARATIVE studies , *RESEARCH funding ,RESEARCH evaluation - Abstract
Background: 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.Research Question: Do postural sway sample durations less than 30 s maintain construct and concurrent validity?Methods: 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.Results: 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.Significance: 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. [ABSTRACT FROM AUTHOR]- Published
- 2021
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