Table 1 Characteristics of the study population. Values indicate the number (proportion) or mean (SD); OAD = Obstructive Airway Disease; COPD = Chronic Obstructive Airway Disease (n = 160)
Asthma n (%) | COPD n (%) | Overlap n (%) | No OAD n (%) | |
|---|---|---|---|---|
n | 75 (46.9) | 25 (15.6) | 8 (5.0) | 52 (32.5) |
Female | 44 (58.7) | 15 (60.0) | 4 (50.0) | 22 (42.3) |
FENO (mean in parts per billion [sd]) | 42.6 [47.9] | 16.2 [11.1] | 20.4 [18.6] | 24.7 [16.0] |
Age (mean in years [sd]) | 38.7 [15.1] | 55.7 [11.9] | 63.5 [10.5] | 42.8 [15.8] |
FEV1 (mean of absolute values in litre [sd]) | 3.43 [0.76] | 2.12 [0.73] | 1.93 [0.55] | 3.52 [0.92] |
FEV1 (mean of % of predicted [sd]) | 100 [12.2] | 67.8 [18.5] | 68.8 [18.4] | 107.4 [12.8] |
FEV1/VC (mean of % [sd]) | 78.45 [7.02] | 59.7 [8.4] | 58.2 [7.6] | 82.1 [5.8] |
Do you ever suffer from shortness of breath? (yes) | 48 (64.0) | 20 (80.0) | 6 (75.0) | 27 (51.9) |
Do you ever suffered from wheezing in your chest? (yes) | 39 (52.0) | 15 (60.0) | 3 (37.5) | 19 (36.5) |
Do you often suffer from a cough? (yes) | 32 (42.7) | 15 (60.0) | 4 (50.0) | 40 (76.9) |
Do you often suffer from expectoration? (yes) | 19 (25.3) | 10 (40.0) | 3 (37.5) | 19 (36.5) |
Have you ever woken up with a feeling of tightness in your chest? (yes) | 19 (25.3) | 4 (16.0) | 3 (37.5) | 8 (15.4) |
Have you ever been woken up by an attack of shortness of breath? (yes) | 21 (28.0) | 3 (12.0) | 2 (25.0) | 9 (17.3) |
Have you ever had an asthma attack? (yes) | 7 (9.3) | 1 (4.0) | 0 (0) | 1 (1.9) |
Do you suffer from any nasal allergies? (yes) | 40 (53.3) | 7 (28.0) | 1 (12.5) | 23 (44.2) |
Do you smoke or did you previously smoke? (yes) | 30 (40.0) | 24 (96.0) | 8 (100) | 24 (46.2) |
How much do/did you smoke? (mean in pack year ([sd]) | 6.7 [13.3] | 35.6 [20.6] | 26.5 [17.4] | 5.0 [11.1] |