was used to evaluate the consistency between meal regularity measured by questionnaire and 3-day recalls. Results The participants were on average 22.5 years-old, and 58% of them were women. The mean (SD) of meal CEI assessed by questionnaire was 3.6(1.1), and the mean(SD) of meal CEI assessed by 3-day dietary recall was 2.2(0.4). Correlation coefficient between meal CEI by questionnaire and meal CEI by 3-day dietary recalls was 0.20 (95% CI: 0.03, 0.36; p=0.024). Correlation coefficient between CEI assessed by questionnaire and mReg assessed by 3-day recalls was -0.35 (95% CI: -0.50, -0.19; p<0.001). ConclusionWe introduced a clock hour-based questionnaire to evaluate people's meal regularity. Its comparative validity was fair. For health survey and nutrition surveillance that always need convenient tools to measure population's health and dietary behaviors, this clock hour-based questionnaire may be applied for assessing the population's meal regularity status.