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Table 1 Variables used in the study

From: Infestation risk of the intermediate snail host of Schistosoma japonicum in the Yangtze River Basin: improved results by spatial reassessment and a random forest approach

Variable

Value

Interquartile range (IQR)

Source

Altitude (m)

141.5

32.8–396.4

Socioeconomic Data and Applications Center of China

Human influence index (HII)a

20.1

16.9–25.5

Human foot printb

31.1

26.1–39.2

Land cover

10

4–16

Distance to the river (km)

9.5

4.7–66.5

Distance to other water bodies (km)

74.5

28.7–156.3

Annual mean temperature (℃)

16.1

15.2–17.1

WorldClim BIO1

Mean diurnal range (max – min temp) (℃)

8.1

7.6–8.5

WorldClim BIO2

Isothermalityc (%)

25.0

24.1–26.26

WorldClim BIO3d

Temperature seasonality

8346.7

7894.1–8718.5

WorldClim BIO4e

Max temperature of the warmest month (℃)

32.1

30.9–32.9

WorldClim BIO5

Min temperature of the coldest month (℃)

3.9

-14.1–15.5

WorldClim BIO6

Temperature annual range (℃)

31.7

30.5–32.8

WorldClim BIO7f

Mean temperature of the wettest quarter (℃)

22.6

21.2–25.7

WorldClim BIO8

Mean temperature of the driest quarter (℃)

6.4

4.5–8.6

WorldClim BIO9

Mean temperature of the warmest quarter (℃)

26.8

25.8–27.5

WorldClim BIO10

Mean temperature of the coldest quarter (℃)

51.8

37.1–62.5

WorldClim BIO11

Annual precipitation (mm)

1374.8

1053.6–521.1

WorldClim BIO12

Precipitation of the wettest month (mm)

218.5

196.4–245.2

WorldClim BIO13

Precipitation of the driest month (mm)

38.1

27.1–45.1

WorldClim BIO14

Precipitation seasonality (mm)

53.1

48.7–59.0

WorldClim BIO15g

Precipitation of the wettest quarter (mm)

584.5

476.2–650.7

WorldClim BIO16

Precipitation of the driest quarter (mm)

139.9

98.8–169.7

WorldClim BIO17

Precipitation of the warmest quarter (mm)

487.8

448.2–544.1

WorldClim BIO18

Precipitation of the coldest quarter (mm)

152.8

100.8–194.6

WorldClim BIO19

  1. ameasure of direct human influence on terrestrial ecosystems based on (1) human settlement; (2) access, such as roads, railroads, rivers, etc.; (3) land use/land cover; and (4) night-time electric light. Values range from 0 to 64, where the former represents no human influence and the latter maximum influence; bheatmap representation of human power over nature on the land surface, ranging from red (highest) to green where wildness still thrives; cmeasure of how large the day-to-night temperatures oscillate relative to the summer-to-winter oscillations; dBIO2/BIO7 × 100; eBIO 4 = standard deviation × 100; fBIO5-BIO6; gCoefficient of variation
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Infectious Diseases of Poverty

ISSN: 2049-9957

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