Skip to main content

Table 2 Summary of quantitative demographic and clinical characteristics

From: Disproportionate utilization of healthcare resources among veterans with COPD: a retrospective analysis of factors associated with COPD healthcare cost

Variable N Mean ± SD Median (25th-75th percentile)α
Age (years) 840 67.29 ±10.85 66 (59–79)
Hospitalizations* 840 0.49 ± 1.00 0 (0–1)
Clinic Visits* 840 4.16 ± 5.43 2 (1–5)
ED Visits* 840 0.28 ± 0.79 0 (0–8)β
Number of Prescriptions* 700 10.55 ± 9.49 7 (4–15)
BMI (kg/m2) 834 27.87 ± 6.83 27 (23–32)
FEV1 (L) 689 1.85 ± 0.80 1.76 (1.21-2.37)
FVC (L) 689 3.23 ± 0.98 3.12 (2.56-3.82)
DLCO (ml/min/mmHg) 540 14.34 ± 6.05 13.5 (9.9-18.2)
EF (%) 390 54 ± 12 58 (53–63)
Maximum serum    
bicarbonate (mEq/L) 758 30.07 ± 3.68 30 (28–32)
Smoking (pack years) 259 62.77 ± 37.53 55 (36–80)
  1. *Per patient; αexcept where indicated; β(minimum-maximum) SD, Standard deviation; ED, Emergency department; BMI, Body mass index; FEV1, Forced expiratory volume in 1 second; FVC, Forced vital capacity; DLCO, Diffusing capacity; EF, Ejection fraction.