Matsuo Tomoaki, So Rina, Sasai Hiroyuki, Ohkawara Kazunori
Occupational Epidemiology Research Group, National Institute of Occupational Safety and Health.
Research Center for Overwork-Related Disorders, National Institute of Occupational Safety and Health.
Sangyo Eiseigaku Zasshi. 2017 Nov 30;59(6):219-228. doi: 10.1539/sangyoeisei.17-018-B. Epub 2017 Sep 26.
The National Institute of Occupational Safety and Health, Japan (JNIOSH) developed a new Worker's Living Activity-time Questionnaire (JNIOSH-WLAQ) which primarily evaluates workers' sedentary behavior. The purpose of this study was to investigate the test-retest reliability and criterion validity of the WLAQ.
One hundred and thirty eight workers completed the WLAQ twice in one week. During the week, they wore a thigh-worn inclinometer (activPAL) and maintained a daily log as criteria measurements. The WLAQ measures working time, commuting time, daily rest period (DRP), sleeping time, and time spent sitting within the four typical domains of a worker's life: (a) working time, (b) commuting time, (c) non-working time on a workday, and (d) non-workday. We calculated intraclass correlation coefficients (ICC) as a reliability value and Spearman's ρ as a validity value. Bland-Altman plots were used to assess any bias.
The analysis of WLAQ indicated favorable ICCs (0.72-0.98) for all living activity-times. The WLAQ had "strong" ρ values for working time (0.80) and DRP (0.83), a "very strong" ρ value for commuting time (0.96), and "moderate" ρ values for sleeping time during a workday (0.69) and a non-workday (0.53). As for the sitting time, the WLAQ had "moderate" ρ values for working time (0.67) and non-working time on a workday (0.59), a "strong" ρ value for commuting time (0.82), and a "low" ρ value for a non-workday (0.40). Bland-Altman plots showed a significant fixed bias for sitting time during working time and significant fixed and proportional biases for sitting time on a non-workday.
The study showed that the WLAQ has acceptable measurement features, which makes this questionnaire a reliable resource for future epidemiological surveys.
日本国立职业安全与健康研究所（JNIOSH）开发了一种新的工人生活活动时间问卷（JNIOSH-WLAQ），主要用于评估工人的久坐行为。本研究的目的是调查WLAQ的重测信度和效标效度。
138名工人在一周内完成了两次WLAQ问卷。在这一周内，他们佩戴了大腿式倾角仪（activPAL），并记录每日日志作为标准测量。WLAQ测量工作时间、通勤时间、每日休息时间（DRP）、睡眠时间以及工人生活四个典型领域内的久坐时间：（a）工作时间，（b）通勤时间，（c）工作日的非工作时间，以及（d）非工作日。我们计算组内相关系数（ICC）作为信度值，斯皮尔曼ρ系数作为效度值。采用布兰德-奥特曼图评估偏差。
对WLAQ的分析表明，所有生活活动时间的ICC值都较好（0.72 - 0.98）。WLAQ在工作时间（0.80）和DRP（0.83）方面具有“强”ρ值，在通勤时间方面具有“非常强”的ρ值（0.96），在工作日睡眠时间（0.69）和非工作日睡眠时间（0.53）方面具有“中等”ρ值。至于久坐时间，WLAQ在工作时间（0.67）和工作日非工作时间（0.59）方面具有“中等”ρ值，在通勤时间方面具有“强”ρ值（0.82），在非工作日具有“低”ρ值（0.40）。布兰德-奥特曼图显示，工作时间的久坐时间存在显著的固定偏差，非工作日的久坐时间存在显著的固定和比例偏差。
该研究表明WLAQ具有可接受的测量特征，这使得该问卷成为未来流行病学调查的可靠资源。
