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Table 2 Comparison of characteristics between entire cohort and the subset group.

From: Determinants of elevated healthcare utilization in patients with COPD

Variable Entire cohort The subset group P value
N 389 177  
Age (yrs)* 68 (59 - 77) 67 (60 - 74) 0.25
Males (%) 77.6% 78.0% 0.93
BMI (kg/m2)* 27 (24 - 31) 27 (23 - 30) 0.57
Pack yrs smoking (yrs)* 50 (30 - 80) 40 (28 - 60) 0.07
FEV1 (% predicted)* 47 (37 - 60) 46 (36 - 58) 0.49
GOLD class 3 or 4 54.0% 59.9% 0.19
Age adjusted CCI* 7 (4 - 9) 6 (4 - 9) 0.71
Annualized healthcare cost* 2200 (1139 - 4934) 2312 (1139 - 5519) 0.61
  1. Abbreviations: BMI- body mass index, FEV1- forced expired volume in one second (as percent predicted), GOLD- global initiative for chronic obstructive lung disease, CCI- Charlson Comorbidity Index.
  2. * median (25-75 percentiles); Mann-Whitney U test; Chi-square test.