Table 1. Summary of all Pearson’s correlation coefficients (ρ).
| Factor | Ref country | Time interval | n | θ | ρ | 95%CI | p-value | Signif |
|---|---|---|---|---|---|---|---|---|
| effd1 | Mexico | 2010-1 to 2015-40 | 34 | 2000 | 0.617 | (0.352, 0.790) | 1.034e-04 | *** |
| effd2 | Mexico | 2010-1 to 2015-40 | 34 | 2000 | 0.626 | (0.365, 0.796) | 7.509e-05 | **** |
| effd1 | China | 2010-1 to 2015-40 | 34 | 2000 | −0.158 | (−0.471, 0.191) | 0.3733 | |
| longitude | — | 2010-1 to 2015-40 | 34 | 2000 | 0.538 | (0.244, 0.741) | 0.0010 | ** |
| latitude | — | 2010-1 to 2015-40 | 34 | 2000 | 0.041 | (−0.301, 0.374) | 0.8173 | |
| effd1 | Mexico | 2010-1 to 2016-8 | 34 | 2000 | 0.495 | (0.188, 0.714) | 0.0029 | ** |
| effd2 | Mexico | 2010-1 to 2016-8 | 34 | 2000 | 0.551 | (0.261, 0.749) | 7.423e-04 | *** |
| effd1 | China | 2010-1 to 2016-8 | 34 | 2000 | −0.196 | (−0.501, 0.152) | 0.2662 | |
| longitude | — | 2010-1 to 2016-8 | 34 | 2000 | 0.537 | (0.243, 0.741) | 0.0011 | ** |
| latitude | — | 2010-1 to 2016-8 | 34 | 2000 | −0.071 | (−0.400, 0.274) | 0.6894 | |
| effd1 | Mexico | 2006-1 to 2016-8 | 34 | 2000 | 0.483 | (0.173, 0.706) | 0.0038 | ** |
| effd2 | Mexico | 2006-1 to 2016-8 | 34 | 2000 | 0.537 | (0.243, 0.741) | 0.0011 | ** |
| effd1 | China | 2006-1 to 2016-8 | 34 | 2000 | −0.215 | (−0.516, 0.133) | 0.2223 | |
| longitude | — | 2006-1 to 2016-8 | 34 | 2000 | 0.520 | (0.221, 0.730) | 0.0016 | ** |
| latitude | — | 2006-1 to 2016-8 | 34 | 2000 | −0.038 | (−0.372, 0.304) | 0.8297 | |
| effd1 | Mexico | 2006-1 to 2008-52 | 30 | 2000 | 0.286 | (−0.083, 0.586) | 0.1252 | |
| effd2 | Mexico | 2006-1 to 2008-52 | 30 | 2000 | 0.354 | (−0.007, 0.634) | 0.0548 | * |
| effd1 | China | 2006-1 to 2008-52 | 30 | 2000 | −0.156 | (−0.489, 0.217) | 0.4113 | |
| longitude | — | 2006-1 to 2008-52 | 30 | 2000 | 0.295 | (−0.073, 0.593) | 0.1130 | |
| latitude | — | 2006-1 to 2008-52 | 30 | 2000 | 0.136 | (−0.236, 0.473) | 0.4749 | |
| effd1 | Mexico | 2006-1 to 2016-8 | 73 | 500 | 0.350 | (0.130, 0.537) | 0.0024 | ** |
| effd2 | Mexico | 2006-1 to 2016-8 | 73 | 500 | 0.411 | (0.200, 0.586) | 3.046e-04 | *** |
| effd1 | China | 2006-1 to 2016-8 | 73 | 500 | −0.135 | (−0.354, 0.098) | 0.2551 | |
| longitude | — | 2006-1 to 2016-8 | 74 | 500 | 0.443 | (0.239, 0.610) | 7.767e-05 | **** |
| latitude | — | 2006-1 to 2016-8 | 74 | 500 | −0.099 | (−0.321, 0.132) | 0.3998 |
n: number of countries in the study. θ: threshold of influenza specimens. For statistical significance levels, ‘*’ refers to p-value range of 0.01 but less than 0.1, ‘**’ refers to range of 0.001 but less than 0.01, ‘***’ refers to range of 0.0001 but less than 0.001, and ‘****’ refers to range of 0.00001 but less than 0.0001.