Primary and restricted analysis - influenza vaccine effectiveness based on sentinel system in Canada 2012–13 season.

BC = British Columbia, AB = Alberta, MB = Manitoba, ON = Ontario, QC = Québec; d = days; NE = not estimable owing to sparse data.a. Adjusted for age (1–8, 9–19, 20–49, ≥50 years), province, interval, week.b. Adjusted for age (1–8, 9–19 years), comorbidity, province, interval, week; except B/Yamagata not adjusted for province.c. Adjusted for comorbidity, province, interval, week; except B/Victoria not adjusted for province.d. Adjusted for age (50–64, ≥65 years), province, interval, week; except A(H1N1)pdm09, influenza B, B/Victoria, B/Yamagata not adjusted for province.