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. 2014 Aug 28;1(1):e000047. doi: 10.1136/bmjresp-2014-000047

Table 2.

Comparisons of baseline characteristics between quitters and continuous smokers

Variables Quitters
n=183
Continuous smokers n=94 p Value
Male sex 122 (66.7) 58 (61.7) 0.414
Age, year 62.9±11.5 57.2±12.6 <0.001
Cigarettes smoked daily, N 21.9±11.1 24.9±14.3 0.059
Duration of smoking, year 40.4±12.8 34.9±12.8 <0.001
Brinkman Index 889.6±580.1 850.3±545.4 0.586
TDS score 7.7±1.6 7.8±1.6 0.569
Exhaled CO, ppm 11.6±8.1 18.2±10.3 <0.001
Body mass index, kg/m2 23.3±4.2 23.0±5.0 0.579
FEV1, % predicted 74.9±19.9 77.3±20.9 0.360
FVC, % predicted 82.1±18.2 84.4±15.6 0.291
FEV1/FVC, % 73.7±12.9 74.6±14.1 0.623
Diseases (self-reported)
 Mental disorder 40 (21.9) 39 (41.5) <0.001
 Diabetes mellitus 34 (18.6) 15 (16.0) 0.586
 Cardiovascular disease 45 (24.6) 15 (16.0) 0.092
 COPD 30 (16.4) 19 (20.2) 0.430
 Bronchial asthma 24 (13.1) 10 (10.6) 0.548
 Cancer 15 (8.2) 7 (7.5) 0.826
SGRQ score
 Symptoms 41.4±23.9 42.4±24.7 0.734
 Activity 34.8±25.6 37.2±27.6 0.478
 Impact 19.3±18.2 22.4±18.4 0.187
 Total 27.7±19.0 30.2±19.8 0.304

Data are presented as number (%) or mean±SD.

COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St. George's Respiratory Questionnaire; TDS, Tobacco Dependence Screener test.