P053 A Chrononutrition Questionnaire to capture sleep, temporal patterns of eating, and chronotype: Reliability and Validity

Chrononutrition investigates temporal patterns of eating. Irregular patterns in shift workers and evening chronotypes adversely affect cardiometabolic health. We investigated the test-retest reliability and convergent validity of a Chrononutrition Questionnaire that aims to capture temporal patterns of eating and chronotype in shift and non-shift workers. 58 non-shift and 47 shift workers completed the study. Outcomes include: 1) chronotype, 2) sleep: wake/sleep/mid-sleep time and sleep duration, 3) temporal eating patterns: meal/snack regularity and frequency, times of first/last/largest eating occasions (EO), main meal (MM) 1/2/3, and duration of eating window (DEW) on work and work-free days (non-shift) and morning/afternoon/night/work-free days (shift workers). Test-retest reliability (intraclass correlation coefficients and weighted kappa), and convergent validity was determined against food and sleep diaries (Spearman Rank Coefficients). Reliability was acceptable for chronotype, sleep, and all temporal eating patterns except morning (last EO) and night shifts (last EO, DEW). Convergent validity was good for chronotype and sleep except for wake times and/or sleep duration on work-free days after morning and afternoon shifts. Meal/snack regularity and frequency showed good validity for non-shift but not shift workers. Times of first/last EO, MM1/2/3 and DEW generally showed good validity except for on work-free days, morning shifts, and night shifts. Time of largest EO was poorly correlated except for night shifts. The Chrononutrition Questionnaire has good test-retest reliability and acceptable convergent validity.