Figure 3From: A prospective longitudinal multicentre study of health related quality of life in ICU survivors with COPDShort Form 36 Health Survey measurements at 6, 12 and 24 months of patients in the chronic obstructive pulmonary disease ICU group providing responses at all three time points. There were no statistically significant changes over time (analyzed using Friedman's test). The non-chronic obstructive pulmonary disease (non-COPD) and COPD reference groups are added for comparison. Values are means.Back to article page