Abstract

BackgroundTo better understand sedentary behaviour and favour international comparisons, more evidence from different countries are needed. However, there are a few tools available in Spanish to measure sedentary behaviour. This study aimed to culturally adapt, translate and validate the Past-day Adults' Sedentary Time (PAST) questionnaire in Chilean adults compared with the ActivPAL.MethodOne hundred one workers wore an ActivPAL for 1 week and were asked to respond to the Spanish version of the PAST twice on different visits at a 7-day interval. The PAST assesses sedentary behaviour in several domains, including working time, during the previous day. Reliability was assessed with the intraclass correlation coefficient (ICC). Correlations and Bland-Altman methods were used to determine accuracy properties of the PAST compared with the ActivPAL.ResultsSeventy-seven participants provided valid data (51.0% male; age=39.012.39years). The PAST showed moderate reliability (ICC=0.63). For the total time in sedentary behavior per day, the PAST showed no correlation (r=0.21, p=0.07) and a mean bias of 54.9min/day (LoA 95%: -484.3, 594.2min/day) with the ActivPAL. For the total time in SB at work, the PAST showed moderate reliability (ICC=0.40), weak correlation (r=0.37, p<0.002), and mean bias was 33.8min/day (LoA 95%: -285.7, 353.3min/day).Conclusions The PAST performed better when estimating sedentary behaviour during working hours compared with the whole day. In this setting, accuracy properties were comparable with other self-report tools.