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Table 4 Predicted and observed risk of mortality based on risk classification using the ACHU (Age, confusion, HIV, urea) respiratory severity score among hospitalized adults with lower respiratory tract infections, South Africa, 2010–2011

From: Development of a respiratory severity score for hospitalized adults in a high HIV-prevalence setting—South Africa, 2010–2011

ACHU Risk Classificationa Score N Predicted Mortality (%) Observed Mortality (%) (95% Confidence Interval) C-statistic
Low ≤1 570 2.4 2.1 (0.1–3.7) 0.769
Low-intermediate 2 110 6.4 6.4 (2.6–12.7)
High-intermediate 3 230 11.9 14.4 (10.1–19.6)
High ≥4 101 29.3 25.7 (17.6–35.4)
  1. aACHU respiratory severity score risk classification categories are based on the number of points an individual patient has based on the presence or absence of risk factors associated with in-hospital mortality from our population. The ACHU scores range from 0 to 6