Reliability and convergent validity of the 6-minute pegboard and ring test in people with Parkinson's disease: a cross-sectional study.

Authors

Rüveyda Gürdal, Hakan Polat, Emel Taşvuran Horata, İbrahim Anıl Tuncer

Published in

Acta neurologica Belgica. Aug 07, 2026. Epub Aug 07, 2026.

Abstract

This study aimed to evaluate the reliability and convergent validity of the 6-Minute Pegboard and Ring Test (6PBRT) in people with Parkinson's disease (PwPD).
A total of 48 PwPD were included in this cross-sectional study (mean age: 67.0 ± 5.5 years). Upper extremity (UE) function was assessed using the 6PBRT, Nine-Hole Peg Test (9HPT), grip strength, shoulder muscle strength, Quick-DASH, and Fatigue Impact Scale (FIS). Intra-rater and inter-rater reliability were analyzed using the intraclass correlation coefficient (ICC [2,1]), standard error of measurement (SEM), and minimal detectable change (MDC). Agreement was evaluated using Bland-Altman analysis. Convergent validity was assessed using Spearman correlation analysis.
The 6PBRT demonstrated excellent intra-rater reliability (ICC = 0.995-0.996) and inter-rater reliability (ICC = 0.995), with low measurement error (SEM = 4.17-4.99 repetitions; MDC = 11.55-13.83 repetitions). Bland-Altman analysis revealed low bias and acceptable limits of agreement, indicating strong absolute reliability. The 6PBRT showed significant moderate-to-strong correlations with the 9HPT (dominant: rho = -0.878; non-dominant: rho = -0.848), shoulder flexor strength (rho = 0.756-0.760), shoulder abductor strength (rho = 0.775-0.787), FIS (rho = -0.657), and Quick-DASH (rho = -0.510) (all p < 0.001).
The 6PBRT demonstrated high reliability and good convergent validity in PwPD. Its significant correlations with UE motor performance, muscle strength, and fatigue support its potential as a clinically relevant outcome measure in rehabilitation practice and research settings for Parkinson's disease. The results apply to early-to-mid stage Parkinson's disease and should not be extrapolated to more advanced stages.

PMID:
42566129
Bibliographic data and abstract were imported from PubMed on 07 Aug 2026.

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