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Table 1 Baseline characteristics of study patients (n = 131)

From: Emphysema distribution and annual changes in pulmonary function in male patients with chronic obstructive pulmonary disease

Age (y)

70.7 ± 8.8

Height (cm)

164.4 ± 6.1

Weight (kg)

58.1 ± 8.9

Smoking status (current: former)

34 : 97

Smoking history (pack-years)

67.7 ± 34.1

Pulmonary function

 

FEV1 (L)

1.63 ± 0.68

%FEV1 (%)

57.9 ± 19.8

RV/TLC (%)

43.3 ± 8.1

DLCO/VA (mL/min/mmHg/L)

2.77 ± 1.08

CT parameters

 

LAV% (%)

33.0 ± 8.6

Total lung volume (L)

5.38 ± 0.9

Proxy for inspiration

0.93 ± 0.13

WA (right apical bronchus %)

57.8 ± 5.8

SD-LAV (%)

4.1 ± 2.5

Difference in LAV% (upper – lower lung)

 

≥ 0% (upper predominant)

n = 94

<0% (lower predominant)

n = 37

  1. Data are expressed as means ± SD.
  2. Abbreviations: FEV1, forced expiratory volume in one second;
  3. %FEV1, FEV1% predicted; RV/TLC, ratio of residual volume to total lung capacity;
  4. DLCO/VA, ratio of diffusing capacity to alveolar ventilation; LAV%, ratio of
  5. low attenuation volume to total lung volume; WA%, wall area percent in right apical bronchus;
  6. Proxy for inspiration was defined as the ratio of CT-derived total lung volume
  7. to physiologically measured total lung capacity;
  8. SD-LAV, standard deviation of LAV% values in 10 partitions with equal volumes.