Table 7

Multivariate analysis of SGRQ-improved versus Non-improved patients with airway obstruction defined by FEV1/FVC<0.7

VariableOR95% CIp Value
TDS score1.641.16 to 2.440.005
Changes in exhaled CO, ppm0.900.82 to 0.990.012
Baseline FEV1, % predicted0.990.93 to 1.050.712
Baseline FVC, % predicted0.990.93 to 1.050.772
Quitter0.260.07 to 0.850.026
COPD1.850.53 to 6.720.335
  • 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.