Presence of trees near the well.

odds Ratio

0.09

6.67

1.25

2.63

2.67

15.75

0.296

nvc

nvc

(x²) pv

(0.02) 5.9

(0.01) 2.8

(0.01) 0.81

(0.2) 1.2

(0.2) 1.2

(0.01) 6.4

(0.3) 1.01

(0.6) 3.6

(0.2) 1.9

95% (CL)

0.01 - 0.7

0.59 - 74.5

0.22 - 7.08

0.45 - 15.3

0.44 - 16.4

1.4 - 174

0.25

0.51 - 1

0.4 - 1

Animal and birds Faeces

odds Ratio

4.5

0.41

0.417

1.77

0.17

0.74

0.29

1

13

(x²) pv

(0.1) 2.4

(0.4) 0.5

(0.3) 0.9

(0.5) 0.4

(0.1) 2.5

(0.8) 0.1

(0.05) 3.8

(1)

(0.03) 42

95% CL

0.63 - 32.29

0.04 - 4.6

0.072 - 66

0.21 - 11.12

0.02 - 1.77

0.12 - 4.76

0.25 - 3.45

0.11 - 8.9

0.79 - 20.7

Other sources of contamination within 10 m, frequency of treating and cleaning of well

odds Ratio

4.26

0.76

0.7

0.21

0.48

0.14

0.76

0.3

0.8

(x²) Pv

(0.2) 1.5

(0.2) 1.5

(0.7) 0.1

(0.3)

(0.5) 0.36

(0.01) 2.7

(1.2) 0.2

(0.2)

1.6

95% (CL)

0.37 - 50.2

0.52 - 0.96

0.07 - 6.2

0.04 - 5.6

0.11 - 1.6

0.58

0.03 - 22.7