Association Between Immunization History and Occurrence of ≥1 RI Episode During Influenza Season
| % RI | Crude OR | Adjusted OR | |
|---|---|---|---|
| Episodes | (95% CI) | (95% CI) | |
| Immunized in current year but no (recent) prior IIV immunization | 7.0 | Ref | Ref |
| Immunized in current year and 1 IIV in previous 2 years | 3.5 | 0.48 (0.37-0.61) | 0.61 (0.47-0.78) |
| Immunized in current year and ≥2 IIVs in previous 3 years, including prior year | 3.7 | 0.50 (0.41-0.62) | 0.85 (0.68-1.07) |
GP = general practitioner; IIV = inactivated influenza vaccine; OR = odds ratio; SES = socioeconomic status; RI = respiratory illness.
Note: Adjusted for SES, age, number of indication categories for IIV, health care–seeking behavior, and number of out-season summer GP-diagnosed RI episodes.