Table 9

Multivariate analysis of SGRQ-improved versus non-improved among early quitters and continuous smokers

VariableOR95% CIp Value
Age, year0.980.94 to 1.020.330
Duration of smoking, year0.990.96 to 1.030.603
TDS score1.391.17 to 1.66<0.001
Baseline FEV1, % predicted0.980.96 to 1.010.134
Baseline FVC, % predicted1.000.97 to 1.030.988
Bronchial asthma1.350.55 to 3.390.508
  • FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St. George's Respiratory Questionnaire; TDS, Tobacco Dependence Screener test.