Unadjusted and bias-corrected effectiveness estimates of the Alachua County school-located influenza vaccination program for 2011/12 epidemic period.

Estimates of the effectiveness (%, bold font) of program toward reducing the number of cases for influenza-like illness associated outpatient visits to sentinel emergency departments and urgent care facilities (ECs), by comparison area, age-group, and correction factors. Ninety-five percent confidence limits are presented directly below each effectiveness estimate. With the exception of the unadjusted effectiveness, all estimates are standardized for differences between Alachua County and the comparison regions in the overall volume of outpatient EC visits (see text of S1 Text for details). Bias correction is also conducted based upon the effects of the SLIV program on the attack rates for outpatient EC visits for three negative control chief complaints (other respiratory illness, gastrointestinal illness, and physical injury), plus the geometric mean of the three effects (All).Unadjusted and bias-corrected effectiveness estimates of the Alachua County school-located influenza vaccination program for 2011/12 epidemic period.