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Table 4

Performance of ISO 7899-2 method for bathing water monitoring

Total number of all colonies/membraneMedian (min–max) of presumptive colony count/membraneNumber of isolatesFalse positive rate (%)False negative rate (%)Sensitivity (%)Specificity (%)Selectivity (%)Efficiency (%)
<10 colonies 4.5 (1–8) 45 18.5 5.6 95.7 77.3 48.9 86.7 
10–100 42.0 (12–62) 234 7.0 20.9 87.5 87.5 56.8 87.6 
>100 colonies 137.0 (106–149) 42 0.0 57.1 77.8 100.0 66.7 81.0 
Unknown NA 20 NA NA NA NA NA NA 
Total number of all colonies/membraneMedian (min–max) of presumptive colony count/membraneNumber of isolatesFalse positive rate (%)False negative rate (%)Sensitivity (%)Specificity (%)Selectivity (%)Efficiency (%)
<10 colonies 4.5 (1–8) 45 18.5 5.6 95.7 77.3 48.9 86.7 
10–100 42.0 (12–62) 234 7.0 20.9 87.5 87.5 56.8 87.6 
>100 colonies 137.0 (106–149) 42 0.0 57.1 77.8 100.0 66.7 81.0 
Unknown NA 20 NA NA NA NA NA NA 

NA; not available.

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