A Simple Clinical Measure of Quadriceps Muscle Strength Identifies Responders to Pulmonary Rehabilitation

Table 2

Baseline assessment data for responders compared to non-responders in the Chronic Respiratory Questionnaire.

	Responders	Nonresponders
Number (%)	44 (52.3%)	40 (47.6%)
Age (years)	66.6±8.2	68.3±10.3	𝑃=0.385
FEV1% predicted	55.5±23.0	55.0±22.1	𝑃=0.925
mMRC	1.8±1.1	1.6±1.0	𝑃=0.384
Quadriceps strength (%)	64.8±23.1	59.4±22.0	𝑃=0.278
Physical activity level (METs)^+	1.52±0.25	1.49±0.20	𝑃=0.697
Interleukin-8 (pg/mL)*	201±514	120±384	𝑃=0.438
C Reactive Protein (pg/mL)*	8765±11327	8998±14108	𝑃=0.937
COPD self-efficacy score	2.8±0.7	2.9±0.8	𝑃=0.554
Charlson comorbidity index	2.2±1.2	1.7±0.8	𝑃=0.051
Metabolic disease	17/44 (39%)	8/40 (20%)	𝑃=0.062
Cardiac disease	12/44 (27%)	13/40 (33%)	𝑃=0.639
Musculoskeletal disease	15/44 (34%)	12/40 (30%)	𝑃=0.688
Baseline CRQ	79±3	95±4	𝑃=0.001

Data expressed as the mean ± standard deviation. FEV₁%: forced expiratory volume in one second, mMRC: modified Medical Research Council dyspnea scale, METs: metabolic equivalent of task, and CRQ: Chronic Respiratory Questionnaire.
∗Systemic inflammatory markers were assessed in 77 participants.
+Physical activity level was assessed in 46 participants.