TABLE 5

Subgroup analyses: differences between the COPD-GRIP (Chronic Obstructive Pulmonary Disease – Guidance, Research on Illness Perception) intervention group and the usual-care group in Clinical COPD Questionnaire scores

Subjects nBaseline6 weeks3 months9 monthsTreatment*time interaction
p-values
MRC score ≤20.595
 Intervention641.3±0.71.3±0.71.3±0.91.5±0.8
 Usual care681.2±0.81.2±0.81.3±0.81.3±0.7
MRC score >20.165
 Intervention203.0±1.13.0±1.13.2±1.13.2±1.1
 Usual care232.7±0.92.9±1.03.0±0.93.0±1.0
Male0.811
 Intervention331.8±1.31.4±0.91.8±1.31.7±1.0
 Usual care411.7±1.01.9±1.11.8±1.11.8±1.3
Female0.126
 Intervention512.2±1.32.1±1.22.3±1.42.2±1.3
 Usual care531.6±1.11.6±1.21.8±1.11.6±1.0

Data are presented as mean±sd, unless otherwise stated. MRC: Medical Research Council.