. Author manuscript; available in PMC: 2019 Oct 1.

Published in final edited form as: J Water Health. 2018 Oct;16(5):711–723. doi: 10.2166/wh.2018.293

Table 6.

Performance characteristics of ISO 7899–2 method for bathing water monitoring.

Colonies/ membrane	Median (min-max) of presumptive colony count/membrane	Number of isolates	False 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	40.5 (1–149)	341	9.0	18.5	90.1	82.9	59.2	87.7

NA; not available.