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Table 2

Contingency table analysis of sanitary risk factors and E. coli presence in the water of dug wells to determine sources of faecal contamination

VariablesE. coli > 0 cfu/ml
ORp
1. Age of the well 4.2 0.021* 
2. Well elevation above ground (in metres) 0.501 0.227 
3. Condition of well casing (covered or not) 0.595 0.456 
4. Is there a faulty drainage channel? Is it broken, permitting ponding? 0.99 0.567 
5. Is there a sanitary structure (pit latrine/septic tank/animal husbandry) within 10 m of the well and hand pump? 9.50 0.012* 
6. Is there any other source of pollution (e.g., animal excreta, rubbish) within 10 m of the well? 5.98 0.021* 
VariablesE. coli > 0 cfu/ml
ORp
1. Age of the well 4.2 0.021* 
2. Well elevation above ground (in metres) 0.501 0.227 
3. Condition of well casing (covered or not) 0.595 0.456 
4. Is there a faulty drainage channel? Is it broken, permitting ponding? 0.99 0.567 
5. Is there a sanitary structure (pit latrine/septic tank/animal husbandry) within 10 m of the well and hand pump? 9.50 0.012* 
6. Is there any other source of pollution (e.g., animal excreta, rubbish) within 10 m of the well? 5.98 0.021* 

OR, odds ratio; p = chi-square value; *significant at the 0.05 level.

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