Skip to main content

Table 1 Comparing hospitalization 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 11.39 10.52 1.08 (1.01–1.16)
Events, No. 1204 2177  
Patient-days, No. 1057293 2069683  
10% Moving Average
Rate 11.34 10.63 1.07 (0.99–1.15)
Events, No. 901 2480  
Patient-days, No. 794239 2332737  
First/Last
Rate 11.26 10.35 1.09 (1.01–1.16)
Events, No. 1777 1604  
Patient-days, No. 1577740 1549236  
5% Total Season
Rate 11.18 10.72 1.04 (0.96–1.13)
Events, No. 687 2694  
Patient-days, No. 614407 2512569  
  1. * Rates are per 10,000 patient-days