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Table 4 Beach management accuracy resulting from use of E. coli culture results available to beach managers (collected on Day0), using Day1 qPCR BAV exceedance as the gold standard

From: Monitoring urban beaches with qPCR vs. culture measures of fecal indicator bacteria: Implications for public notification

Beach Correct: advisory Correct: no advisory Failure to act False alarm Total
1 4 (3.8) 58 (55.2) 6 (5.7) 37 (35.2) 105 (100)
2 0 (0.0) 37 (92.5) 0 (0.0) 3 (7.5) 40 (100)
3 1 (2.3) 36 (81.8) 3 (6.8) 4 (9.1) 44 (100)
4 0 (0.0) 36 (83.7) 0 (0.0) 7 (16.3) 43 (100)
5 0 (0.0) 33 (71.7) 2 (4.4) 11 (23.9) 46 (100)
6 5 (5.0) 67 (67.0) 5 (5.0) 23 (23.0) 100 (100)
7 0 (0.0) 77 (81.9) 4 (4.3) 13 (13.8) 94 (100)
8 2 (2.0) 66 (64.7) 6 (5.9) 28 (27.5) 102 (100)
9 1 (1.0) 59 (57.8) 6 (5.9) 36 (35.3) 102 (100)
All 13 (1.9) 469 (69.4) 32 (4.7) 162 (24.0) 676 (100)