Table 2 Interaction between shortest distances to inland waters and poultry densities in contributing to H7N9 infection at the neighborhood level.

From: Estimating Risks of Inapparent Avian Exposure for Human Infection: Avian Influenza Virus A (H7N9) in Zhejiang Province, China

Interaction detector C = A∩B

 

Linear combination A+B

Graphical representation

Interpretation

river∩chicken = 0.076

>

0.046 = river(0.014)+chicken(0.032)

⇑

river∩goose = 0.063

>

0.045 = river(0.014)+goose(0.031)

⇑

river∩duck = 0.050

>

0.019 = river(0.014)+duck(0.005)

⇑

lake∩chicken = 0.086

>

0.082 = lake(0.050)+chicken(0.032)

⇑

lake∩goose = 0.076

<

0.081 = lake(0.050)+goose(0.031)

↑

lake∩duck = 0.071

>

0.055 = lake(0.050)+duck(0.005)

⇑

  1. Note: A and B indicate inland waters and poultry densities respectively; A ⇑ B denotes nonlinear enhancement of A and B when C > A+B; A ↑ B denotes A and B enhance each other when C > A, B.
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