Table 3 Between-estimates heterogeneity (as measured by the I2 statistics) for summary relative illness ratio calculated for each influenza virus within each age group, and variables significantly (p<0.05) correlating with them. The Global Influenza B Study, 1999-2014
Influenza virus | I2 | Variables significantly (p<0.05) correlating with sRIRs | |||||
|---|---|---|---|---|---|---|---|
Latitude | % of cases accounted for in the same season | % of cases accounted for in the previous season | Ageing index | GDP per capita | % of outpatients (a) | ||
Young children (0-4 years) | |||||||
A(H1N1) | 97.5% | ||||||
A(H1N1)pdm2009 | 97.8% | ✓ | ✓ | ✓ | |||
A(H3N2) | 98.2% | ✓ | ✓ | ✓ | |||
B | 97.5% | ✓ | ✓ | ✓ | |||
Older children (5-17 years) | |||||||
A(H1N1) | 95.2% | ✓ | |||||
A(H1N1)pdm2009 | 99.5% | ✓ | ✓ | ✓ | |||
A(H3N2) | 97.2% | ✓ | ✓ | ✓ | |||
B | 98.4% | ✓ | ✓ | ✓ | ✓ | ✓ | |
Young adults (18-39 years) | |||||||
A(H1N1) | 97.1% | ✓ | ✓ | ||||
A(H1N1)pdm2009 | 97.5% | ✓ | ✓ | ✓ | |||
A(H3N2) | 96.0% | ✓ | ✓ | ✓ | |||
B | 98.1% | ✓ | ✓ | ✓ | ✓ | ||
Older adults (40-64 years) | |||||||
A(H1N1) | 95.2% | ||||||
A(H1N1)pdm2009 | 98.7% | ✓ | ✓ | ||||
A(H3N2) | 93.5% | ✓ | ✓ | ||||
B | 96.6% | ✓ | ✓ | ✓ | ✓ | ||
Elderly (65+ years) | |||||||
A(H1N1) | 73.9% | ||||||
A(H1N1)pdm2009 | 94.7% | ✓ | ✓ | ✓ | ✓ | ||
A(H3N2) | 95.2% | ✓ | ✓ | ✓ | |||
B | 92.4% | ✓ | ✓ | ||||