Figure 1.
Study event rates among the elderly ≥65 years old over the study period from 1999–2000 to 2008–2009 influenza seasons in Taiwan.
Panel A and Panel B represents pneumonia and influenza (P&I)-related outpatient visit and hospitalization rates. The actual observed events (Blue-shaded area), model-predicted events (Red line) and age-standardized events (black dashed line) are expressed as monthly rates per 100. Panel C represents viral surveillance data expressed as the weekly percentage of tests positive for influenza viruses. Horizontal line sets the cutoff of isolation rate ≥10% and the influenza epidemic months are shaded in blue. Panel D represents the annual trivalent influenza vaccine (TIV) vaccination rate among the elderly in percentage. No free TIV vaccination was provided for the 5–19 age group during 1999,9–2007,8.
Figure 2.
Age-specific event rates over the study period from 1999–2000 to 2008–2009 influenza seasons in Taiwan.
Panel A and Panel B represents pneumonia and influenza (P&I)-related outpatient visit and hospitalization rates. Panel C represents the annual trivalent influenza vaccine (TIV) vaccination rate in percentage.
Figure 3.
Predicted propensity scores between TIV-receiving and TIV non-receiving elderly over the study period from 1999–2000 to 2008–2009 influenza seasons in Taiwan.
Table 1.
Demographic characteristics and comorbidity medical disorders between TIV-receive and non-receive groups among the elderly ≥65 in years by propensity score logistic regression model.
Table 2.
Primary analysis results of two fitted multivariate Poisson regression models for pneumonia/influenza-associated outpatient visits and hospitalization among the elderly from Sep., 1999 to Aug., 2009.
Table 3.
Epidemic and annual excess influenza-associated morbidity rates among the elderly (per 1,000).