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Table 2

SFIB concentrations in the riverine water during heavy rainfall, light rainfall and the period of no rainfall

SFIB concentration (log10 cfu/100 ml)
Rainfall intensityStatisticsE. coliENTCP
Heavy rainfall 5% percentile 2.4 2.3 1.5 
Median 3.7 4.1 2.1 
95% percentile 4.8 5.1 4.3 
n 38 38 38 
Light rainfall 5% percentile 1.7 2.1 1.5 
Median 2.8 3.6 2.1 
95% percentile 3.8 4.1 3.2 
n 14 14 14 
Little or no rainfall 5% percentile np np np 
Median 2.4 2.0 1.8 
95% percentile np np np 
n 
Kruskal–Wallis H-test p-value 0.001 <0.001 0.053 
SFIB concentration (log10 cfu/100 ml)
Rainfall intensityStatisticsE. coliENTCP
Heavy rainfall 5% percentile 2.4 2.3 1.5 
Median 3.7 4.1 2.1 
95% percentile 4.8 5.1 4.3 
n 38 38 38 
Light rainfall 5% percentile 1.7 2.1 1.5 
Median 2.8 3.6 2.1 
95% percentile 3.8 4.1 3.2 
n 14 14 14 
Little or no rainfall 5% percentile np np np 
Median 2.4 2.0 1.8 
95% percentile np np np 
n 
Kruskal–Wallis H-test p-value 0.001 <0.001 0.053 

CP, Clostridium perfringens spores; ENT, enterococci; n, the number of samples; np, calculation not possible. See Figure 6 for the definition of heavy, light and little or no rainfall categories.

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