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Table 2 Main differences between the population in which the 2008 score was developed and the present population. All p ≤ 0.001

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

Variable Present population 2008 population
Sex, % women 23.2 30.0
Age (years, mean ± SD ) 70.3 ± 11.3 72.5 ± 11.8
Smoking status, %   
Non smoker 6.6 19.3
Ex smoker 60.8 49.9
Smoker 32.6 30.8
MRC dyspnea grade at steady state, %   
0/1 17.1 22.5
2-3 69.9 46.2
4 13.0 31.3
Maintenance treatment, %   
LTOT 37.7 23.2
Inhaled corticosteroids 72.4 43.8
Oral corticosteroids 7.8 13.8
Bronchodilators 86.6 69.6
Clinical signs of severity, %   
Cyanosis 22.1 29.0
Use of accessory inspiratory muscles 27.9 50.9
Paradoxical abdominal movement 8.6 36.8
Asterixis 1.8 7.8
Neurological impairment 6.9 11.8
Lower limb edema 13.3 23.3
Number of clinical signs of severity, %   
None 44.1 27.6
1 -2 45.9 47.7
 ≥ 3 10.0 24.7
Mortality (%) 2.5 7.9