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Table 1 Patients with respiratory infections according to case definition and pH1N1 status, demographic and clinical characteristics, hospital-based surveillance of acute respiratory infections, Berlin 2009/10

From: Lessons from a one-year hospital-based surveillance of acute respiratory infections in Berlin- comparing case definitions to monitor influenza

Cases Definition (number of cases) % male Median age, females* Median age, males % requiring ICU treatment % requiring mechanical ventilation % pH1N1 positive among tested Duration of hospital stay (median) Case fatality
CD1 (n = 1,025) 61%* 49 y 51 y 12% 6% 6% 6 days 4%
CD1b (n = 742) 62%* 50 y 51 y 11% 5% 4% 6 days 4%
CD4 (n = 283) 57%* 45 y 50 y* 14% 7% 7% 7 days 2%
pH1N1-positive (n = 20) 65% 42 y 46 y 20% 7% 100% 6 days 0%
  1. * statistically significant (p < 0.05) when compared to female cases
  2. See text and Figure 1 for explanation of CD1, 1b and 4