Table 1 Results of the boosted regression trees applied to the occurrence of human infection with avian influenza A (H7N9) virus data

From: Mapping Spread and Risk of Avian Influenza A (H7N9) in China

 

Boosted regression tree

Variable*

Weight (mean)

Weight (sd)

Number of live poultry markets

28.57

7.13

Density of poultry

2.39

0.99

Density of pigs

2.14

0.95

Density of humans

8.23

2.99

Freeway

3.34

1.77

National highway

2.16

0.90

Lake

3.26

2.23

River

2.02

0.98

Reservoir

0.84

0.83

Percentage coverage of irrigated croplands

11.76

4.81

Percentage coverage of rainfed croplands

2.85

1.51

Percentage coverage of built-up land

8.55

3.95

Wetland

3.18

1.45

Relative humidity

8.38

3.23

Temperature

12.32

3.93

  1. *Variables whose mean of weight in the BRT models more than 5 were considered to be significantly contribute to the occurrence of human infection with avian influenza A (H7N9) virus.
Back to article page