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Table 1 Baseline characteristics from Phase 1

From: Clinical, physiologic, and radiographic factors contributing to development of hypoxemia in moderate to severe COPD: a cohort study

Variable

n = 678

Age, years

63 ± 8

Non-Hispanic white race

525 (77%)

Male sex

375 (55%)

Enrollment at Denver clinical site

132 (19%)

BMI, kg/m2

28.2 ± 5.8

Baseline heart rate, beats/min

76 ± 12

Baseline oxygen saturation, %

95.5 ± 2.4

Current Smokers

248 (37%)

Pack Year History

52 ± 26

Coronary Artery Disease

102 (15%)

Congestive Heart Failure

20 (3%)

Hypertension

315 (47%)

Hyperlipidemia

277 (41%)

Asthma

178 (26%)

Sleep apnea

137 (20%)

Thromboembolic disease

26 (4%)

Peripheral vascular disease

23 (3%)

Cerebrovascular disease

36 (5%)

Gastroesophageal reflux disease

215 (32%)

FEV1, percent predicted

54 ± 16

FEV1/FVC

0.51 ± 0.12

GOLD 2

405 (59.7%)

GOLD 3

215 (31.7%)

GOLD 4

58 (8.6%)

Percent emphysema, -950 HU

12.7 ± 11.7

Percent gas trapping

38 ± 19

PA/A ratio

0.89 ± 0.13

PA/A ratio >1

127 (19%)

Severe AECOPD 1-year prior

101 (15%)

MMRC

1.8 ± 1.4

SGRQ, total

35 ± 21

6MWD, ft

1277 ± 361

  1. Values represent mean ± SD or n (%)
  2. Definitions: FEV1 forced expiratory volume in 1-s, FVC forced vital capacity, GOLD Global initiative for obstructive lung disease, PA pulmonary artery, A aorta, AECOPD acute exacerbation of COPD, MMRC modified medical research council, SGRQ St. George’s Respiratory Questionnaire, 6MWD 6-min walk distance