“…We adjusted the analyses for the following potential confounders: age (continuous variable), sex (categorical variable: man, woman), year of survey reply (categorical variable: 2012, 2014, 2016, 2018), education (categorical variable: unskilled and skilled workers, further education), use of assistive devices (categorical variable: “always”, “often”, “sometimes”, “seldom”, “never”), leisure-time physical activity (continuous variable: total weekly hours of leisure-time physical activity), body mass index (BMI, kg/m 2 , continuous variable), smoking status (categorical variable: daily, sometimes, ex-smoker, never), psychosocial work factors (continuous variable), and depressive symptoms (continuous variable) ( 12 , 15 , 19 , 20 ). Psychosocial work factors were based on the Copenhagen Psychosocial Questionnaire (COPSOQ), which include six items about job strain and two items about influence at work, each converted to a 0–100 scale (0 = worst, 100 = best) ( 21 ).…”