Table 5.

A multivariate logistic regression model for the risk factors of COPD exacerbation using conventional clinical and physiological information

Hosmer-Lemeshow goodness-of-fit showed chi-square = 6.52 and P = 0.59, showing good fit of the models; C-statistics value was 0.694. Clinico-physiologic indices with a univariate P value < 0.2 were considered candidates in the backward stepwise multiple logistic regression. Initial variables for multiple logistic regression were age, current smoking, hospitalization due to exacerbation during past one year, Charlson index score, body mass index, modified MRC dyspnea scale, 6 minute walk distance, St. George Rspiratory Questionnaires score, FEV₁, % predicted.