Figure 3

Percentage change (%) of mortality counts for all-cause and cardiorespiratory (CRD) mortality. The risks associated with 1% increase in influenza virus activity during the low-, middle- and high-vapor pressure periods were plotted for the age groups younger than 65 years (< 65) and equal or over 65 years (≥65). The 95% confidence intervals were shown in vertical bars. An asterisk is added above the bars if the interaction between vapor pressure and influenza is shown statistically significant by the likelihood ratio test between main effects and interaction models.