Table 2 Summary Relative Illness Ratio (sRIR), lower and upper 95% confidence intervals (CI), and between-estimates heterogeneity (as measured by the I2 statistics) for A(H1N1), A(H1N1)pdm2009, A(H3N2) and B influenza virus within each age group. The Global Influenza B Study, 1999-2014
Influenza virus | sRIR | lower CI (a) | upper CI (a) | I2 |
|---|---|---|---|---|
Young children (0-4 years) | ||||
A(H1N1) | 3.57 | 3.00 | 4.14 | 97.5% |
A(H1N1)pdm2009 | 2.28 | 2.10 | 2.46 | 97.8% |
A(H3N2) | 3.30 | 2.95 | 3.64 | 98.2% |
B | 2.93 | 2.68 | 3.19 | 97.5% |
Older children (5-17 years) | ||||
A(H1N1) | 1.36 | 1.19 | 1.54 | 95.2% |
A(H1N1)pdm2009 | 1.23 | 1.02 | 1.45 | 99.5% |
A(H3N2) | 1.04 | 0.93 | 1.14 | 97.2% |
B | 1.69 | 1.53 | 1.85 | 98.4% |
Young adults (18-39 years) | ||||
A(H1N1) | 0.84 | 0.72 | 0.96 | 97.1% |
A(H1N1)pdm2009 | 0.94 | 0.87 | 1.01 | 97.5% |
A(H3N2) | 0.73 | 0.68 | 0.78 | 96.0% |
B | 0.65 | 0.59 | 0.71 | 98.1% |
Older adults (40-64 years) | ||||
A(H1N1) | 0.49 | 0.41 | 0.57 | 95.2% |
A(H1N1)pdm2009 | 0.62 | 0.55 | 0.69 | 98.7% |
A(H3N2) | 0.59 | 0.55 | 0.63 | 93.5% |
B | 0.41 | 0.37 | 0.45 | 96.6% |
Elderly (65+ years) | ||||
A(H1N1) | 0.16 | 0.12 | 0.20 | 73.9% |
A(H1N1)pdm2009 | 0.27 | 0.24 | 0.31 | 94.7% |
A(H3N2) | 0.74 | 0.66 | 0.83 | 95.2% |
B | 0.38 | 0.33 | 0.43 | 92.4% |