Table 2: Mean daily activity in counts per minute in COPD patients ( ) and controls ( ), stratified for employment status (COPD: employed ( )/unemployed ( ), controls: employed ( )/unemployed ( )).

COPD patientsControls95% CI value

Day
 Employed
 Unemployed
Morning (8–13 h)
 Employed
 Unemployed
Afternoon (13–17 h)
 Employed
 Unemployed
Evening (17–20 h)
  Employed
 Unemployed

Data is presented as mean ± SD. 95% CI: 95% confidence interval of the difference.