Fig. 3
From: The effect of changes to GOLD severity stage on long term morbidity and mortality in COPD
Univariate and multivariate (“adjusted”) Kaplan-Meier survival plots showing time to all-cause mortality from initial TARDIS visit. a, c & e show univariate plots, b, d & f are “adjusted” multivariate plots derived from a non-time dependent Cox model. The top two plots a & b are for the primary outcome (all-cause mortality); the middle two c & d for respiratory specific mortality; and the bottom two e & f for respiratory hospitalisation