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Table 2 Table of Prior Known COPD status vs. Spirometry COPD Diagnosis

From: Chronic obstructive pulmonary disease prevalence and prediction in a high-risk lung cancer screening population

Characteristic

Overall Population (N = 2514)

Prior Diagnosis of COPD

(N = 527)

n (%)

No prior diagnosis of COPD (N = 1987)

n (%)

p-value*

COPD by Spirometry:

   

< 0.001

 Definite/Probable

1136 (45.2)

303 (57.5)

833 (41.9)

 

 Uncertain

107 (4.3)

54 (10.3)

53 (2.7)

 

 None

1271 (50.6)

170 (32.2)

1101 (55.4)

 

Severity of Spirometry Diagnosis COPD (among definite/probable)

   

< 0.001

 Stage I (Mild)

456 (40.1)

71 (23.4)

385 (46.2)

 

 Stage II (Moderate)

583 (51.3)

173 (57.1)

410 (49.2)

 

 Stage III (Severe)

87 (7.7)

51 (16.8)

36 (4.3)

 

 Stage IV (Very Severe)

10 (0.9)

8 (2.6)

2 (0.2)

 
  1. *Comparison of prior diagnosis of COPD to no prior diagnosis of COPD by chi-square