Table 3.

p-values in the comparisons of the predictive accuracy of the BODE index and the GOLD 2007, GOLD 2011, and GOLD 2017 classifications using ROC curve analyses

	p-values for mortality	p-values for respiratory hospitalization
BODE vs GOLD 2007	0.002	0.009
BODE vs GOLD 2011	0.088	0.175
BODE vs GOLD 2017	0.979	0.765
GOLD 2007 vs GOLD 2011	0.150	0.715
GOLD 2007 vs GOLD 2017	0.013	0.308
GOLD 2011 vs GOLD 2017	0.045	0.296

Abbreviations: ROC, Receiver Operation Characteristic; BODE, BMI, Obstruction, Dyspnea, Exercise; GOLD, Global Initiative for Chronic Obstructive Lung Disease.