FIGURE 2.

Predictors of vaccination among test‐negative controls and predictors of testing positive for influenza (case) and testing negative for influenza (control), by vaccination status, based on odds ratios adjusted for age, sex, calendar time, and season that do not include one in the 95%CI. Variables that are predictors of both vaccination status and the outcome are marked in bold. The covariates included in the analyses were presence of at least one, at least two, and at least three chronic diseases (≥1, ≥2, ≥3 chronic); presence of cancer, cardiovascular disease, diabetes, lung disease, renal disease, and obesity; and number of hospitalizations and primary care visits in the last year.’‐’ signifies no significant predictors.