Table 3.

Model performance by all data

Smoking category	p from Hosmer-Lemeshow goodness of fit	AUC† (95% CI)	Concordance statistic (95% CI)‡
Never smokers	0.493	0.583 (0.550–0.617)	0.71 (0.67–0.77)
Former smokers	0.260	0.681 (0.646–0.715)	0.74 (0.72–0.79)
Current smokers	0.502	0.532 (0.512–0.553)	0.71 (0.67–0.76)

^† AUC, Area under curve by the receiver operating characteristic curve

^‡ Derived from 999-fold cross-validation of combined dataset