Validity, reliability, and measurement error of the Japanese version of the Freezing of Gait Questionnaire for patients with Parkinson’s disease

The Freezing of Gait Questionnaire has been translated into several languages. However, it has not been translated into Japanese and its measurement error remains unclear. <b>Objectives:</b> This study aimed to translate the Freezing of Gait Questionnaire into Japanese, investigate its validity and reliability, and calculate its measurement errors. Thirty-five patients with Parkinson’s disease participated in the study. The Freezing of Gait Questionnaire was translated into Japanese using a forward – backward translation method. Convergent validity was assessed using the Freezing of Gait Questionnaire and Unified Parkinson’s Disease Rating Scale Part II(item 14-freezing). The content validity index was calculated using the Freezing of Gait Questionnaire score using correlation coefficients. Internal consistency was measured using Cronbach’s alpha. The test – retest reliability was evaluated using the intraclass correlation coefficient(1,1). The Bland – Altman analysis was performed to detect the limits of agreement. The mean Freezing of Gait Questionnaire score was 9.1 (5.0) points. Convergent validity was 0.655 and content validity index was 0.958. Cronbach’s alpha was 0.958, intraclass correlation coefficient(1,1) was 0.951, and the limits of agreement ranged from − 4.9 to3.2 points. The Japanese version of the Freezing of Gait Questionnaire is a valid and useful tool to evaluate patients with Parkinson’s disease.

步态冻结问卷（Freezing of Gait Questionnaire）已被译为多种语言，但尚未推出日语版本，且其测量误差仍未明确。<b>研究目的：</b>本研究旨在将步态冻结问卷翻译为日语版本，考察其效度与信度，并计算其测量误差。本研究共纳入35名帕金森病患者。研究采用正反向翻译法完成步态冻结问卷的日语版本翻译。采用步态冻结问卷与统一帕金森病评定量表（Unified Parkinson’s Disease Rating Scale）第二部分（第14项——冻结症状）评估聚合效度；通过相关系数计算步态冻结问卷得分的内容效度指数。采用克朗巴赫α系数（Cronbach’s alpha）衡量内部一致性。采用组内相关系数（intraclass correlation coefficient）(1,1)评估重测信度。采用布兰德-奥特曼分析（Bland-Altman analysis）计算一致性界限。本研究中，步态冻结问卷的平均得分为9.1（5.0）分。聚合效度系数为0.655，内容效度指数为0.958。克朗巴赫α系数为0.958，组内相关系数(1,1)为0.951，一致性界限范围为-4.9至3.2分。日语版步态冻结问卷是一款用于评估帕金森病患者的有效且实用的工具。