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Table 6

Statistical analysis of the four chromogenic culture-based methods for the detection of total coliform 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® 0.78 0.72 62.22 <0.0001         
Chromocult coliform® agar 0.87 0.85 1.22 0.2224 0.79 0.73 52.66 <0.0001     
DC agar with BCIG 0.83 0.79 44.55 <0.0001 0.84 0.81 6.19 <0.0001 0.82 0.78 35.31 <0.0001 
MI agarColilert®Chromocult coliform® agar
MethodsIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valueaIndex of agreementCohen kappaMcNemarp valuea
Colilert® 0.78 0.72 62.22 <0.0001         
Chromocult coliform® agar 0.87 0.85 1.22 0.2224 0.79 0.73 52.66 <0.0001     
DC agar with BCIG 0.83 0.79 44.55 <0.0001 0.84 0.81 6.19 <0.0001 0.82 0.78 35.31 <0.0001 

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

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