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Table 3 Weibull models for mortality

From: Does the 2013 GOLD classification improve the ability to predict lung function decline, exacerbations and mortality: a post-hoc analysis of the 4-year UPLIFT trial

Classification system C-statistic AIC
GOLD stage 2 to 4 0.6936 5644.299
GOLD stage A to D 0.6755 5709.177
GOLD stage A, B, C1 to C3 and D1 to D3 0.6861 5693.128
  1. Harrell’s c-statistic and Akaike’s Information Criterion.