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Table 3 Mortality rates by categories of the 2008 score and the new score

From: A clinical in-hospital prognostic score for acute exacerbations of COPD

2008 score New score
Categories Groups* Deaths n (%) Tertiles Deaths n (%)
Derivation cohort Validation cohort
0-1 point 692 (37.9%) 5 (0.7%) 0 point 1 (0.3%) 0 (0%)
2-3 points 672 (36.8%) 11 (1.6%) 1-2 points 4 (1.3%) 5 (1.6%)
4-6 points 460 (25.2%) 29 (6.3%) 3-9 points 18 (5.8%) 17 (5.5%)
  1. *defined with reference to the distribution (i.e., tertiles) of the 2008 score in the 2008 population.
  2. The new score was built using data collected in the studied population.