Impact of sitting at work on musculoskeletal complaints of German workers - results from the study on mental health at work (S-MGA)

Table 8 Associations between baseline workplace sitting in 2012 and lower back complaints in the last 12 months in 2017 (yes/no) stratified by leisure time physical activity to baseline among 2,082 employees aged 31–60 years in Germany. Poisson regressions. Prevalence Rations (PR)

Exposure	Strata defined by leisure time physical activity prior to baseline
Exposure	Lower back, n = 1177
Occupational sitting 2012	none of the time		little/some of the time		mostly/all the time
Occupational sitting 2012	PR	95% CI	PR	95% CI	PR	95% CI
Model 3
Under 5 h/week	1	(Ref)	1	(Ref)	1	(Ref)
5 to < 15 h/week	1.15	0.98–1.36	1.00	0.86–1.17	0.71	0.50–1.01
15 to < 25 h/week	1.22	1.01–1.47	1.13	0.96–1.33	0.80	0.57–1.12
25 to < 35 h/week	1.32	1.07–1.63	1.03	0.85–1.24	0.88	0.54–1.41
35 or more hours/week	1.08	0.87–1.43	1.03	0.85–1.25	0.66	0.34–1.29

Model 3: adjusted for sex, age, occupational level, BMI, smoking, musculoskeletal diseases at baseline, psychological disorders and lifting/carrying heavy loads at work
PR: prevalence ratio, Ref.: reference category

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