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Table 2 Subject characteristics of the patients who quitted smoking.

From: Elevation of sputum matrix metalloproteinase-9 persists up to 6 months after smoking cessation: a research study

  Asymptomatic smokers Smokers with asthma Chronic bronchitis/COPD
Subjects (n)    
3 mo 6 4 7
6 mo 4 4 1
Female/Male    
3 mo 3/3 3/1 4/3
6 mo 3/1 3/1 1/0
Age yrs    
3 mo 47 ± 6 46 ± 2 59 ± 11
6 mo 50 ± 5 46 ± 2 57
Pack-yrs    
3 mo 15 ± 10 21 ± 18 36 ± 14
6 mo 19 ± 11 21 ± 18 21
Post-bronchodilator    
FVC L    
3 mo 4.2 ± 0.65 3.7 ± 0.68 2.9 ± 0.48
6 mo 3.9 ± 0.67 3.7 ± 0.68 3.5
FVC % pred    
3 mo 95 ± 6 99 ± 27 85 ± 9
6 mo 96 ± 6 99 ± 27 83
FEV1 L    
3 mo 3.5 ± 0.68 3.0 ± 0.53 2.1 ± 0.43
6 mo 3.2 ± 0.71 3.0 ± 0.53 2.35
FEV1% pred    
3 mo 96 ± 5 98 ± 26 75 ± 8
6 mo 97 ± 6 98 ± 26 70
FEV1/FVC    
3 mo 83 ± 4 82 ± 2 71 ± 7
6 mo 82 ± 5 82 ± 2 82 ± 2