Influenza vaccine effectiveness in preventing admissions related to H3N2 influenza.

Positives admissions with influenza confirmed influenza by real time reverse transcription polymerase chain reaction (rtRT-PCR). Negatives admissions with a negative rtRT-PCR result for influenza. IVE influenza vaccine effectiveness. CI Confidence Interval.a Strong evidence (Pb Moderate evidence of between hospital variability (P = 0.045) and of between epidemiological week variability (P = 0.015). Hospital and epidemiological week included as a random effect parameter in the multilevel analysis to estimate influenza vaccine effectiveness in this group, adjusted as in (a).c Weak evidence of between hospital variability (P>0.05). Strong evidence (P = d Weak evidence of between hospital variability (P = 0.497). Strong evidence (P = e Moderate evidence (P = 0.042) of between hospital variability and strong evidence (P = Influenza vaccine effectiveness in preventing admissions related to H3N2 influenza.