6 months − 11 years (n = 777) | ≥60 years (n = 409) | |||
---|---|---|---|---|
Influenza cases | Controls | Influenza cases | Controls | |
n = 212 | n = 565 | n = 130 | n = 279 | |
Age | 100 % | 100 % | 100 % | 100 % |
Gender | 100 % | 100 % | 100 % | 100 % |
Clinical information | ||||
Date of onset of illness | 100 % | 100 % | 100 % | 100 % |
Date of specimen collection | 92 % | 95 % | 95 % | 100 % |
Preexisting conditions (yes/no) | 67 % | 61 % | 88 % | 87 % |
Vaccination information | ||||
Vaccination status for current influenza vaccinea | 88 % | 88 % | 82 % | 91 % |
Date of current influenza vaccine receipt | 100 % | 100 % | 100 % | 100 % |
Vaccination status for a second annual dose among children 6 months–9 yearsb | 67 % (121/193) | 57 % (289/503) | NAc | NA |
Prior season influenza vaccination | 96 % | 96 % | 84 % | 94 % |
Pneumococcal vaccination statusd | 80 % | 86 % | 34 % | 19 % |
Number of complete records for key variables for vaccine effectiveness analysese | 170 (80 %) | 471 (83 %) | 100 (77 %) | 253 (91 %) |
Number of complete records for all variables collectedf | 151 (71 %) | 458 (81 %) | 34 (26 %) | 51 (18 %) |