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Table 3 Comparing death rates during the influenza season and non-influenza season using different methods of defining the influenza season, 1986–87 to 1990–91.

From: Comparing estimates of influenza-associated hospitalization and death among adults with congestive heart failure based on how influenza season is defined

  Influenza Season* Non-Influenza Season* Relative Risk (95% Confidence Interval)
5% Moving Average
Rate 27.10 24.87 1.09 (0.97–1.21)
Events, No. 475 841  
Patient-days, No. 1752471 3382155  
10% Moving Average
Rate 27.13 25.11 1.08 (0.95–1.21)
Events, No. 358 958  
Patient-days, No. 1319485 3815141  
First/Last
Rate 27.34 23.86 1.15 (1.02–1.27)
Events, No. 713 603  
Patient-days, No. 2607851 2526805  
5% Total Season
Rate 26.79 25.35 1.06 (0.92–1.20)
Events, No. 271 1045  
Patient-days, No. 1011662 4122964  
  1. * Rates are per 100,000 patient-days