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Table 2 Summary of household variables

From: Open-source environmental data as an alternative to snail surveys to assess schistosomiasis risk in areas approaching elimination

household variables

N

%

  

Shared model characteristics

    

 Number of infections per household

    

  0

244

86.22

  

  1

33

11.66

  

  2 + 

6

2.12

  

 Number of people tested per household

    

  1

83

29.33

  

  2

146

51.59

  

  3

42

14.84

  

  4 + 

12

4.24

  

Snail models

Mean

SD

Min.

Max.

 Ditches

    

  Distance from home to nearest present ditch (km)

0.57

0.89

 < 0.01

3.26

  Length of present ditches within 0.25 km of the home (km)

0.24

0.28

0.00

0.97

  Length of present ditches within 0.5 km of the home (km)

0.65

0.61

0.00

2.69

  Length of present ditches within 1 km of the home (km)

1.74

1.70

0.00

7.31

  Distance from home to nearest absent ditch (km)

0.26

0.23

 < 0.01

1.05

  Length of absent ditches within 0.25 km of the home (km)

0.23

0.28

0.00

0.93

  Length of absent ditches within 0.5 km of the home (km)

0.77

0.65

0.00

2.11

  Length of absent ditches within 1 km of the home (km)

2.22

1.35

0.00

6.80

 Fields

    

  Distance from home to nearest present field (km)

0.58

0.51

 < 0.01

1.55

  Area of present fields within 0.25 km of the home (km2)

0.01

0.01

0.00

0.05

  Area of present fields within 0.5 km of the home (km2)

0.02

0.04

0.00

0.13

  Area of present fields within 1 km of the home (km2)

0.04

0.06

0.00

0.16

  Distance from home to nearest absent field (km)

0.36

0.54

 < 0.01

2.20

  Area of absent fields within 0.25 km of the home (km2)

0.01

0.01

0.00

0.19

  Area of absent fields within 0.5 km of the home (km2)

0.02

0.02

0.00

0.09

  Area of absent fields within 1 km of the home (km2)

0.06

0.06

0.00

0.04

Environmental data models

Mean

SD

Min.

Max.

 Built and natural environment

    

  Distance from home to the nearest waterway (km)

3.02

1.82

0.06

5.44

  Distance from home to the nearest waterbody (km)

2.11

0.95

0.37

3.91

  Distance from home to the nearest road (km)

0.36

0.26

 < 0.01

1.27

  Elevation of the home (m)

573.45

54.81

495.0

685.0

 Remotely sensed data

    

  Mean NDWI within 0.25 km of the home

− 0.19

0.02

− 0.23

− 0.15

  Mean NDWI within 0.5 km of the home

− 0.19

0.02

− 0.21

− 0.16

  Mean NDWI within 1 km of the home

− 0.19

0.01

− 0.20

− 0.17

  Mean NDVI within 0.25 km of the home

0.18

0.02

0.14

0.23

  Mean NDVI within 0.5 km of the home

0.18

0.02

0.14

0.22

  Mean NDVI within 1 km of the home

0.18

0.02

0.15

0.21

  Mean EVI within 0.25 km of the home

0.40

0.03

0.36

0.48

  Mean EVI within 0.5 km of the home

0.40

0.02

0.37

0.47

  Mean EVI within 1 km of the home

0.40

0.02

0.38

0.46

  1. NDWI Normalized difference Water Index, NDVI Normalized difference Vegetation Index, EVI Enhanced Vegetation Index