Reliability and variability of physiotherapists scoring freezing of gait through video analysis

Aileen E Scully; Kenneth Neo; Eunice Lim; Prakash K Manharlal; Beatriz de Oliveira; Keith D Hill; Ross Allan Clark; Yang Hao Pua; Dawn Tan

doi:10.1080/09593985.2023.2252059

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Reliability and variability of physiotherapists scoring freezing of gait through video analysis

Journal article

Peer reviewed

Reliability and variability of physiotherapists scoring freezing of gait through video analysis

Aileen E Scully, Kenneth Neo, Eunice Lim, Prakash K Manharlal, Beatriz de Oliveira, Keith D Hill, Ross Allan Clark, Yang Hao Pua and Dawn Tan

Physiotherapy Theory and Practice, Vol.40(11), pp.2641-2651

2024

DOI: https://doi.org/10.1080/09593985.2023.2252059

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Abstract

assessment

freezing of gait

Parkinson's disease

reliability

variability

Background: The “gold standard” marker for freezing of gait severity is percentage of time spent with freezing observed through video analysis. Objective: This study examined inter- and intra-rater reliability and variability of physiotherapists rating freezing of gait severity through video analysis and explored the effects of experience. Methods: Thirty physiotherapists rated 14 videos of Timed Up and Go performance by people with Parkinson’s and gait freezing. Ten videos were unique, while four were repeated. Freezing frequency, total duration, and percentage of time spent with freezing were computed. Reliability and variability were estimated using ICC (2,1) and mean absolute differences. Between-group differences were calculated with the one-way ANOVA. Results: Inter- and intra-rater reliability ranged from moderate to good (ICC: inter-rater frequency = 0.63, duration = 0.78, percentage = 0.50; intra-rater frequency = 0.84, duration = 0.89, percentage = 0.50). Variability for freezing frequency was two episodes. Inter- and intra-rater variability for total freezing duration was 18.8 and 12.3 seconds, respectively. For percentage of time spent with freezing, this was 15.2% and 13.5%. Physiotherapy experience had no effect. Conclusion: Physiotherapists demonstrated sufficient reliability, but variability was large enough to cause changes in severity classifications on existing rating scales. Percentage of time spent with freezing was the least reliable marker, supporting the use of freezing frequency or total duration instead.

Details

Title: Reliability and variability of physiotherapists scoring freezing of gait through video analysis
Authors: Aileen E Scully (Corresponding Author) - Curtin University
Kenneth Neo (Author) - Singapore Institute of Technology
Eunice Lim (Author) - Singapore Institute of Technology
Prakash K Manharlal (Author) - Singapore General Hospital
Beatriz de Oliveira (Author) - Curtin University
Keith D Hill (Author) - Monash University
Ross Allan Clark (Author) - University of the Sunshine Coast, Queensland, School of Health - Public Health
Yang Hao Pua (Author) - Singapore General Hospital
Dawn Tan (Author) - Singapore Institute of Technology
Publication details: Physiotherapy Theory and Practice, Vol.40(11), pp.2641-2651
Publisher: Taylor & Francis Inc.
Date published: 2024
DOI: 10.1080/09593985.2023.2252059
ISSN: 1532-5040
Organisation Unit: School of Health - Public Health; Healthy Ageing Research Cluster
Language: English
Record Identifier: 99746896902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Rehabilitation

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