Table 4 Comparison of estimated risk of death associated with influenza season using different methods of defining the influenza season.
Flu Season Definition | Unadjusted Hazard Ratio (95% CI) | Adjusted Hazard Ratio* (95% CI) | Number of deaths attributable to influenza | Rate of Attributable Excess Deaths** (95%CI) |
|---|---|---|---|---|
5% Moving Average | 1.10 (0.98–1.22) | 1.16 (1.04–1.29) | 66 | 4.69 (3.61 to 5.96) |
10% Moving Average | 1.03 (0.92–1.15) | 1.08 (0.97–1.21) | 27 | 1.92 (1.27 to 2.79) |
First/Last Isolate | 1.11 (0.995–1.24) | 1.19 (1.06–1.33) | 114 | 8.10(6.59 to 9.85) |
5% Total Season Isolates | 0.997 (0.881–1.13) | 1.04 (0.92–1.18) | 10 | 0.71 (0.34 to 1.31) |