Validity and reliability of a new clinician-rated tool for freezing of gait severity

The Freezing of Gait Severity Tool (FOG Tool) was developed because of limitations in existing assessments. This cross-sectional study investigated its validity and reliability. People with Parkinson's disease (PD) were recruited consecutively from clinics. Those who could not walk eight-metres...

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Bibliographic Details
Published in:Disability and rehabilitation 2024-07, Vol.46 (14), p.3133-3140
Main Authors: Scully, Aileen Eugenia, Tan, Dawn May Leng, de Oliveira, Beatriz Ir, Hill, Keith David, Clark, Ross, Pua, Yong Hao
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Cross-Sectional Studies
Disability Evaluation
Female
Gait - physiology
Gait Disorders, Neurologic - physiopathology
Humans
Male
Middle Aged
Parkinson Disease - complications
Parkinson Disease - physiopathology
Reproducibility of Results
Severity of Illness Index
Surveys and Questionnaires
Citations: Items that this one cites
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Summary:The Freezing of Gait Severity Tool (FOG Tool) was developed because of limitations in existing assessments. This cross-sectional study investigated its validity and reliability. People with Parkinson's disease (PD) were recruited consecutively from clinics. Those who could not walk eight-metres independently (with or without an assistive device), comprehend instructions, or with co-morbidities affecting walking were excluded. Participants completed a set of assessments including the FOG Tool, Timed Up and Go (TUG), and Freezing of Gait Questionnaire. The FOG Tool was repeated and those reporting no medication state change evaluated for test-retest reliability. Validity and reliability were investigated through Spearman's correlations and ICC (two-way, random). McNemar's test was applied to compare the FOG Tool and TUG on the proportion of people with freezing. Thirty-nine participants were recruited [79.5%(  = 31) male; Median(IQR): age-73.0(9.0) years; disease duration-4.0(5.8) years]. Fifteen (38.5%) contributed to test-retest reliability analyses. The FOG Tool demonstrated strongest associations with the Freezing of Gait Questionnaire (ρ = 0.67, 95%CI 0.43-0.83). Test-retest reliability was excellent (ICC = 0.96, 95%CI 0.88-0.99). The FOG Tool had 6.2 times the odds (95%CI 2.4-20.4,  
ISSN:0963-8288
1464-5165
1464-5165
DOI:10.1080/09638288.2023.2242257