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Table 3 Correlations between changes in 6MWD with diaphragm excursion and baseline characteristics

From: Diaphragmatic excursion is correlated with the improvement in exercise tolerance after pulmonary rehabilitation in patients with chronic obstructive pulmonary disease

Independent variable Total patients (n = 50)
Pearson correlation p value
coefficient (r)
Age, year  − 0.10 0.48
BMI, kg/m2  − 0.02 0.89
CAT  − 0.34 0.017
FVC %predicted 0.19 0.18
FEV1 %predicted 0.45 0.001
6MWD, m 0.28 0.052
mBorg scale dyspnoea  − 0.34 0.017
PImax, cmH2O 0.58 < 0.001
DEmax, mm 0.72 < 0.001
QMS, kgf/kg 0.31 0.028
  1. BMI body mass index, CAT COPD assessment test, FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, 6MWD 6-min walk distance, mBorg modified Borg, PImax maximum inspiratory pressure, DEmax maximum diaphragmatic excursion, QMS quadriceps muscle strength