Effect of per cent sitting time at work on trajectories of neck–shoulder pain intensity (scale 0–10) in the Danish PHysical ACTivity cohort with Objective measurements (DPHACTO) study population
| 95% CI | |||||
|---|---|---|---|---|---|
| Estimate | SE | p Value | Lower | Upper | |
| Model 1 (n=625) | |||||
| Intercept | 2.976 | 0.179 | <0.01 | 2.624 | 3.327 |
| Time | −0.020 | 0.010 | 0.053 | −0.040 | 0.000 |
| Sitting | 0.000 | 0.005 | 0.966 | −0.009 | 0.010 |
| Interaction (sitting×time) | −0.001 | 0.000 | 0.020 | −0.001 | 0.000 |
| Model 2 (n=610) | |||||
| Intercept | 1.280 | 0.695 | 0.066 | −0.085 | 2.645 |
| Time | −0.019 | 0.010 | 0.072 | −0.039 | 0.002 |
| Sitting | 0.003 | 0.005 | 0.582 | −0.007 | 0.012 |
| Interaction (sitting×time) | −0.001 | 0.000 | 0.020 | −0.001 | 0.000 |
| Model 3 (n=595) | |||||
| Intercept | 3.020 | 1.084 | 0.006 | 0.891 | 5.149 |
| Time | −0.019 | 0.010 | 0.065 | −0.040 | 0.001 |
| Sitting | 0.012 | 0.006 | 0.055 | 0.000 | 0.025 |
| Interaction (sitting×time) | −0.001 | 0.000 | 0.027 | −0.001 | 0.000 |
Model 1: unadjusted.
Model 2: adjusted for gender, age and body mass index.
Model 3: adjusted for the covariates in model 2 and occupational sector, lifting/carrying time at work, sitting time at leisure, physical activity at work and leisure, upper arm elevation >60° at work.
‘Time’ indicates the 14 pain ratings over 12 months, starting at baseline; ‘sitting’ represents sitting time in percentage of working hours; ‘interaction’ indicates the effect of sitting on the rate of change in pain intensity over time.