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Table 1 Patient Characteristics

From: Comparison of health-related quality of life measures in chronic obstructive pulmonary disease

Characteristic
Mean (SD)
Total Sample
(n = 120)
GOLD
Stage 1
(n = 23)
GOLD
Stage 2
(n = 53)
GOLD
Stage 3
(n = 27)
GOLD
Stage 4
(n = 17)
p-value
Age 71.2 (10.3) 72.3 (11.5) 71.7 (11.4) 70.4 (8.4) 73.3 (7.9) 0.82
Male, n (%) 118 (98.3) 23 (100) 52 (98.1) 26 (96.3) 17 (100) 0.71
Race, n (%)       0.18
   White 113 (94.2) 20 (87.0) 52 (98.1) 26 (96.3) 15 (88.2)  
   Black 6 (5.0) 3 (13.0) 0 (0.0) 1 (3.7) 2 (11.8)  
   Other 1 (0.8) 0 (0.0) 1 (1.9) 0 (0.0) 0 (0.0)  
Smoking status, n (%)       0.18
   Current 11 (9.2) 3 (13.0) 8 (15.1) 8 (29.6) 0 (0.0)  
   Past 90 (75.0) 17 (73.9) 39 (73.6) 18 (66.7) 16 (94.1)  
   Never 19 (15.8) 3 (13.0) 6 (11.3) 1 (3.7) 1 (5.9)  
BMI (Kg/m2) 29.1 (5.2) 30.6 (4.3) 29.6 (5.1) 29.2 (5.6) 25.3 (4.6) 0.01
Smoke-years (n = 109) 33.7 (15.0) 26.2 (13.0) 34.6 (15.2) 39.5 (13.3) 31.3 (16.1) 0.02
Packs/day (n = 105) 1.57 (0.83) 1.71 (1.10) 1.51 (0.88) 1.44 (0.60) 1.75 (0.68) 0.56
Pack-years (n = 109) 54.0 (37.9) 48.9 (46.0) 54.3 (42.2) 55.2 (26.2) 57.0 (32.7) 0.93
  1. based on Chi-square or ANOVA