Changes in prevalence of influenza vaccination and strength of association of factors predicting influenza vaccination over time—Results of two population-based surveys

Two cross-sectional population-based telephone surveys interviewed 877 and 1103 respondents aged ≥65. When compared to the first survey, respondents of the second survey were more likely to have heard of influenza vaccination (IV) (adjusted OR = 4.09), to have received IV (adjusted OR = 2.04) or to have done so in the last 6 months (adjusted OR = 1.53), and to perceive IV as efficacious (adjusted OR = 1.63). The strength of associations between predictors and IV outcomes differed in the two surveys; e.g., OR between perceived health impact and ever having received IV were, respectively, 1.11 (p > 0.05) versus 1.91 (p < 0.05). IV-related behaviors and perceptions therefore changed over time.