Table 2 Relationship between environment factors and Japanese encephalitis incidence in Guizhou Province, 2004–2016

GDP per capita

(categorical, 1000 Yuan)

 < 7

21.06 (16.44, 25.69)

–

–

 7–12

23.45 (19.96, 26.93)

–

–

 > 12

17.37 (12.84, 21.89)

–

–

GDP per capita

(continuous, 1000 Yuan)

–

0.99 (0.98, 0.99)**

0.97 (0.96, 0.98)**

Precipitation (categorical, 10 mm)

 < 110

24.31 (17.02, 31.58)

–

–

 110–125

19.88 (17.24, 22.52)

–

–

 > 125

23.82 (16.04, 31.60)

–

–

Precipitation (continuous, 10 mm)

–

1 (0.99, 1.01)

–

Average temperature (categorical, 1 °C)

 < 14

24.12 (16.57, 31.68)

–

–

 14–15.8

20.42 (17.08, 23.76)

–

–

 > 15.8

21.56 (17.56, 25.57)

–

–

Average temperature (continuous, 1 °C)

–

1 (0.97, 1.04)

-

Croplands (categorical, 1%)

 < 25

19.96 (17.15, 22.78)

1

1

 25–35

21.11 (15.72, 26.50)

1.06 (0.94, 1.19)

0.89 (0.78, 1.03)

 > 35

30.84 (22.69, 38.98)

1.54 (1.35, 1.77)**

1.58 (1.47, 1.68)**

Vegetation (categorical, 1%)

 < 30

24.77 (19.77, 29.79)

1

1

 30–55

21.89 (18.51, 25.26)

0.88 (0.79, 0.98)*

0.79 (0.69, 0.92)**

 > 55

15.80 (11.54, 20.06)

0.64 (0.55, 0.73)**

0.57 (0.47, 0.68)**

Urban areas (categorical, 1%)

 < 0.12

21.64 (17.13, 26.15)

1

1

 0.12–0.25

23.36 (19.01, 27.70)

1.08 (0.95, 1.21)

1.08 (0.95, 1.22)

 > 0.25

19.04 (15.15, 22.92)

0.87 (0.78, 0.99)*

0.80 (0.68, 0.94)*

Water bodies (categorical, 10%)

 < 0.08

17.81 (12.70, 22.92)

1

1

 0.08–2.1

20.95 (16.67, 25.22)

1.22 (1.08, 1.38)**

1.10 (0.97, 1.26)

 > 2.1

23.59 (19.96, 27.23)

1.20 (1.04, 1.37)*

1.02 (0.87, 1.21)