“…Covariates were chosen based on the potential association between physical activity and analgesic use and activity limitation for LBP. Previous research has shown that activity limitation and analgesic use for LBP can be associated with factors such as pain intensity (Monticone et al, 2021; Oliveira et al, 2019; Patterson et al, 2021; Severeijns et al, 2001; Sturgeon, 2014) and duration (Hayden et al, 2010; Sribastav et al, 2018), depression (Grabovac & Dorner, 2019; Monticone et al, 2021; Oliveira et al, 2019; Pinheiro et al, 2015; Severeijns et al, 2001; Sturgeon, 2014), anxiety (Grabovac & Dorner, 2019; Monticone et al, 2021; Oliveira et al, 2019; Severeijns et al, 2001; Sturgeon, 2014), stress (Grabovac & Dorner, 2019; Severeijns et al, 2001; Sturgeon, 2014), sleep quality (Ho et al, 2021; Kovacs et al, 2018; Patterson et al, 2021), level of disability (Ferreira et al, 2010; Monticone et al, 2021; Oliveira et al, 2019; Severeijns et al, 2001; Sturgeon, 2014), age (Mannion et al, 2013), gender (Ferreira et al, 2010; Ho et al, 2021; Mannion et al, 2013) and body mass index (BMI) (Hashimoto et al, 2018; Miura et al, 2019; Sribastav et al, 2018; Stevans et al, 2021). Therefore, the confounding effects of these aforementioned factors on analgesic use and activity limitation were accounted for in the study analysis.…”