Research Article

Escherichia coli as a Tool for Disease Risk Assessment of Drinking Water Sources

Table 2

Comparison of E. coli counts (MPN/100 ml) in the various water sources (SD = standard deviation, df = degree of freedom, Min = minimum, and Max = maximum).

Water sourcesDry seasonWet season value
Mean ± SDMinMaxdfMean ± SDMinMaxdf

Bore hole0.63 ± 0.740271 ± 0.760270.090
Canal47.67 ± 16.043163259.67 ± 45.082311020.280
Dam38.07 ± 30.7171101439.87 ± 19.761279140.350
Hand-dug well0.93 ± 0.8002141.47 ± 1.0604140.001
River0 ± 00024.33 ± 2.522720.050
Stream15.06 ± 13.590331620.77 ± 11.05031160.020