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Table 7

Statistical analysis of the four chromogenic culture-based methods for the detection of E. coli in well water samples (n = 635)

MI agarColilert®Chromocult coliform® agar
MethodsIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valuea
Colilert® 0.92 0.92 1.33 0.1836         
Chromocult coliform® agar 0.92 0.91 1.28 0.2006 0.90 0.89 5.55 <0.0001     
DC agar with BCIG 0.94 0.93 4.90 <0.0001 0.91 0.90 1.14 0.2542 0.91 0.90 8.64 <0.0001 
MI agarColilert®Chromocult coliform® agar
MethodsIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valuea
Colilert® 0.92 0.92 1.33 0.1836         
Chromocult coliform® agar 0.92 0.91 1.28 0.2006 0.90 0.89 5.55 <0.0001     
DC agar with BCIG 0.94 0.93 4.90 <0.0001 0.91 0.90 1.14 0.2542 0.91 0.90 8.64 <0.0001 

aA p value of <0.05 is necessary to establish a statistically significant difference.

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