AOAC RI ERP Final Action Recommendations eBook
AOAC EXPERT REVIEW PANEL FOR MICROBIOLOGY FOR FOODS AND ENVIRONMENTAL SURFACES AOAC Expert Review Panel Final Action Feedback f 95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
Table 7. BAX® System Presumptive vs. Confirmed Results – Poultry and EggRevised Data Sample Type Media MPN a Test Portions BAX® Presumptive BAX® Confirmed X b POD CP c 95% CI f X b POD CC d 95% CI f
e
95% CI f
dPOD CP
Control
5
0 9
0
0
5 8
0
(0-0.43)
0 0
(-0.45, 0.45) (-0.24, 0.33)
0.63 (0.40, 1.0) 3.7 (2.0, 9.6)
(0.26, 0.66) (0.57, 1.0)
(0.22, 0.61) (0.57, 1.0)
Ground turkey (25 g)
20
0.45
0.40
BPW
5
5
1.0
5
1.0
0
(-0.45, 0.45)
a MPN = Most Probable Number based on the POD of reference method test portions using the AOAC MPN calculator (with 95% confidence interval) b X = Number of positive test portions c POD CP = Candidate method presumptive positive outcomes divided by the total number of trials d POD CC = Candidate method confirmed positive outcomes divided by the total number of trials e dPOD CP = Difference between the candidate method presumptive result and candidate method confirmed result POD values f 95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
Table 8. BAX® System vs. Reference Method Results – Poultry and EggRevised Data Sample Type Media MPN a Test Portions BAX® Method X b POD C c 95% CI f X b POD CC d
e
95% CI f
Reference Method
dPOD C
95% CI f (0, 0.43)
(-0.45, 0.45) (-0.14, 0.14) (-0.45, 0.45)
Control
5
0
0
(0, 0.43) 0
0
0
Ground turkey (25 g)
0.63 (0.40, 1.0) 3.7 (2.0, 9.6)
(0.22, 0.61) (0.57, 1.0)
(0.22, 0.61)
BPW
20
8
0.40
8
0.40
0
5
5
1.0
5
1.0
(0.57, 1.0)
0
a MPN = Most Probable Number based on the POD of reference method test portions using the AOAC MPN calculator (with 95% confidence interval) b X = Number of positive test portions c POD C = Confirmed candidate method positive outcomes divided by the total number of trials
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