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Table 2 Description of 138 patients with respiratory tract infections seeking urgent primary care

From: The prevalence of undiagnosed chronic obstructive pulmonary disease in a primary care population with respiratory tract infections - a case finding study

Variables

Total

COPD

Non-COPD

N (%)

138

38 (27)

100 (73)

Age

    

Years, mean [95%CI]

55 [54-57]

62 [59-64]

53 [51-55]

Agegroup 40-54 years n (%)

62

5 (13)

57 (57)

Agegroup 55-70 years n (%)

76

33 (87)

43 (43)

Smoking intensity

    

Pack years*, mean [95%CI]

24 [22-26]

32 [27-36]

21 [19-24]

Pack years*, median [range]

20 [5-75]

31 [5-75]

 

20 [5-56]

Smoking status

    

Current smokers, n (%)

73

25 (65.8)

48 (48.0)

Former smokers, n (%)

65

13 (34.2)

52 (52.0)

Diagnosis

    

Upper resp. infection, n (%)

57

15 (39.5)

42 (42.0)

Lower resp. infection, n (%)

79

23 (60.5)

56 (56.0)

Viral infection/influenza, n (%)

2

0 (0)

2 (2.0)

Sex

    

Female, n (%)

 

19 (50)

58 (58)

Male

 

19 (50)

42 (42)

Spirometry

    

FEV1% of predicted, mean [95%CI]

95.7 [92.6-98.8]

77.5 [71.2-84.0]

102.6 [100.2-105.1]

FEV1/FVC ratio, mean [95%CI]

0.73 [0.71-0.75]

0.60 [0.57-0.63]

0.78 [0.77-0.79]

COPD severity**

 

N

%

 

Stage 1 (mild, FEV1 ≥ 80% of predicted)

 

17

(44.7)

 

Stage 2 (moderate, 50% ≤ FEV1 < 80% of predicted)

 

20

(52.6)

 

Stage 3 (severe, 30% ≤ FEV1 < 50% of predicted)

 

1

(2.6)

 

Stage 4 (very severe, FEV1 < 30% of predicted)

 

0

(0)

 
  1. Numbers in total and divided into groups with or without COPD.
  2. *Number of pack years = (number of cigarettes smoked per day × number of years smoked/20)
  3. ** According to Global Initiative for Chronic Obstructive Lung Disease (GOLD)