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| Period | Sites epidemically related to the incidence of human H7N9 infection | Sites not epidemically related to the incidence of H7N9 infection | χ2 | P-value |
|---|---|---|---|---|
| March 2013 to April 2013 | 12.60%(16/127) | 2.16%(13/603) | 29.987 | <0.01 |
| December 2013 to February 2014 | 19.62%(62/316) | 17.20%(536/3116) | 1.167 | >0.05 |
| χ2 | 3.079 | 90.89 | ||
| P-value | >0.05 | <0.01 |
