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Table 1 Patient characteristics, patient-reported outcomes and exercise test outcomes at baseline

From: Association between patient-reported outcomes and exercise test outcomes in patients with COPD before and after pulmonary rehabilitation

  Whole group n Completers n Non-completers n
N = 518   N = 419   N = 99  
Patient characteristics
 Gender, male (%) 288 (55.6) 518 232 (55.4) 419 56 (56.6) 99
 Age, years 64.1 ± 9.1 518 64.3 ± 8.8 419 63.2 ± 10.3 99
 Current smoker, n (%) 114 (22.1) 518 79 (18.9) 419 35 (35.4)* 98
 Pack years, n 40.0 (30.0–50.0) 518 40.0 (30.0–50.0) 403 40.0 (30.0–51.0) 93
 BMI, kg/m2 26.2 ± 5.8 518 26.2 ± 5.7 419 26.2 ± 6.3 99
 FFMI, kg/m2 17.0 ± 2.5 499 17.0 ± 2.4 405 17.0 ± 2.6 94
 FEV1, L 1.29 ± 0.60 518 1.30 ± 0.60 419 1.26 ± 0.60 99
 FEV1% predicted 48.6 ± 20.0 518 48.9 ± 20.0 419 47.3 ± 20.1 99
 FEV1 / FVC, % 37.5 ± 12.2 518 37.3 ± 12.1 419 38.4 ± 12.9 99
 mMRC-score (0/1/2/3/4), % 2/17/38/25/18 512 2/17/40/22/18 414 0/15/27/36/22 98
 GOLD classification (I/II/III/IV), % 7/36/37/20 518 8/36/35/21 419 6/33/43/17 99
 GOLD classification (A/B/C/D), % 3/20/5/72 518 2/22/5/71 419 5/12/5/78 99
Oxygen saturation, % 94.6 (92.7–96.0) 510 94.6 (92.8–96.0) 414 94.0 (92.0–96.0) 96
 LTOT, n (%) 125 (24.1) 518 104 (24.8) 419 21 (21.2) 96
Patient-reported outcomes
 mMRC score, points 2.4 ± 1.0 512 2.4 ± 1.0 414 2.7 ± 1.0 98
 SGRQ-C total score, points 61.1 ± 17.4 504 60.1 ± 17.1 409 65.4 ± 18.1* 95
 CAT total score, points 21.5 ± 6.6 505 21.5 ± 6.6 410 21.7 ± 6.9 95
 CCQ total score, points 2.6 ± 1.0 502 2.6 ± 1.0 409 2.8 ± 1.1 93
 HADS-A score, points 7.8 ± 4.5 500 7.5 ± 4.4 407 9.0 ± 4.9* 93
 HADS-D score, points 7.5 ± 4.3 500 7.4 ± 4.2 407 8.0 ± 4.9 93
 CDS total score, points 72.0 (68.0–75.0) 480 69.7 ± 7.2 389 68.4 ± 7.9 91
Exercise test outcomes
 6MWD, meters 424 ± 124 513 431 ± 124 417 393 ± 123* 96
 CPET Wmax, W 70.1 ± 34.2 493 70.9 ± 33.7 407 66.6 ± 36.7 86
 CPET VO2peak, ml/min 1090 ± 414 390 1094 ± 407 316 1071 ± 446 74
 CWRT endurance time, seconds 224 (169–327) 477 235 (174–338) 392 199 (149–294)* 85
 TUG test time, seconds 9.8 (8.5–11.8) 500 9.6 (8.3–11.6) 408 10.2 (8.7–12.7) 92
 Quadriceps peak torque, Nm 94.1 ± 36.4 466 94.4 ± 35.9 383 93.5 ± 39.1 83
 Quadriceps total work, J 1627 ± 741 465 1641 ± 724 382 1559 ± 815 83
  1. Summary variables are presented as n (%) for discrete variables, mean ± standard deviation for quantitative variables or median (Interquartile range) for skewed variables, * p<0.01. ‘n’ represents the total number of sample values per analysis
  2. Abbreviations: BMI body mass index, FFMI Fat Free Mass Index, FEV1 forced expiratory volume in the first second, FVC forced vital capacity, mMRC modified Medical Research Council scale, GOLD Global Initiative for Chronic Obstructive Lung Disease, LTOT Long Term Oxygen Therapy, mMRC modified Medical Research Council scale, SGRQ-C COPD-specific St. George Respiratory Questionnaire score, CAT COPD Assessment Test, CCQ Clinical COPD Questionnaire, HADS-A Hospital Anxiety and Depression Scale, Anxiety subscale, HADS-D Hospital Anxiety and Depression Scale, Depression subscale, CDS Care Dependency Scale, 6MWD 6-min walking distance, CPET Cardiopulmonary Exercise Test, Wmax maximal achieved workload, W Watts, VO2peak peak oxygen uptake, ml = milliliter min = minute, CWRT Constant Work-Rate Test, TUG Timed ‘Up and Go’, Nm Newtonmeter, J Joules