Objective
To evaluate the validity and reliability of the Thai version of the Freezing of Gait Questionnaire (FOG-Q) in individuals with Parkinson’s disease (PD).
Methods
The FOG-Q was translated into Thai according to the standard process. Fifty-six individuals with PD participated in the study. The content validity was assessed using the content validity index (CVI). The construct validity was evaluated by correlating Thai FOG-Q with Thai version of the Movement Disorder Society-sponsored revision of the Unified Parkinson’s Disease Rating Scale (MDS-UPDRS) items 2.13 and 3.11, Thai version of the Falls Efficacy Scale-International (FES-I), Timed Up and Go test (TUG) and Berg Balance Scale (BBS) using Spearman’s correlation coefficient (rS). The correlation between Thai FOG-Q and clinical characteristics, for example, duration of PD and modified Hoehn and Yahr (mH&Y) stage was evaluated. Internal consistency and test-retest reliability were evaluated with Cronbach’s alpha (Cα) and intraclass correlation coefficient (ICC), respectively.
Results
The Thai FOG-Q had high content validity (CVI=0.96). The mean FOG-Q score was 9.0±4.9. The construct validity showed a strong positive correlation with MDS-UPDRS item 2.13 (rS=0.81), and moderate correlations with MDS-UPDRS item 3.11, FES-I, and TUG (rS=0.42–0.60). A negative correlation with BBS was found (rS=-0.32). It had a moderate correlation with mH&Y stage (rS=0.40). The Thai FOG-Q had good internal consistency (Cα=0.87) with excellent test-retest reliability (ICC=0.91).
Conclusion
The Thai FOG-Q has excellent validity and reliability. It is a useful instrument for the evaluation of FOG in individuals with PD.

Citations

• Validity, reliability, and measurement error of the Japanese version of the Freezing of Gait Questionnaire for patients with Parkinson’s disease
  Katsuya Sakai, Tsubasa Kawasaki, Hiroya Kiminarita, Kichol Kim, Jyunya Ogawa
  Physiotherapy Theory and Practice.2025; 41(4): 820.     CrossRef
• A Graph‐Theoretic Approach to Detection of Parkinsonian Freezing of Gait From Videos
  Qi Liu, Jie Bao, Xu Zhang, Chuan Shi, Catherine Liu, Rui Luo
  Statistics in Medicine.2025;[Epub]     CrossRef
• Psychometric properties of outcome measures for freezing of gait in Parkinson’s disease: a systematic review and meta-analysis
  Prisca Proietti, Ilaria Ruotolo, Alessandra Carlizza, Alessandro Ugolini, Giovanni Galeoto, Giovanni Fabbrini, Giovanni Sellitto
  Expert Review of Pharmacoeconomics & Outcomes Research.2025; 25(5): 647.     CrossRef
• The validation of a Japanese version of the New Freezing of Gait Questionnaire (NFOG-Q)
  Seira Taniguchi, Kohei Marumoto, Yuta Kajiyama, Gajanan Revankar, Michiko Inoue, Hiroshi Yamamoto, Rika Kayano, Eiji Mizuta, Ryuichi Takahashi, Emi Shirahata, Chizu Saeki, Tatsuhiko Ozono, Yasuyoshi Kimura, Kensuke Ikenaka, Hideki Mochizuki
  Neurological Sciences.2024; 45(7): 3147.     CrossRef
• A VO2peak prediction model in older adults' patients with Parkinson's disease
  Jaime Vásquez-Gómez, Armando Cifuentes-Amigo, Marcelo Castillo-Retamal, Antonio R. Zamunér
  Experimental Gerontology.2023; 181: 112285.     CrossRef