AOAC RI ERP Final Action Recommendations eBook
Dupont BAX Salmonella Pre- Collaborative Study For Expert Review Panel Use Only Do Not Distribute
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Table 15. BAX® System vs. Reference Method Results – Miscellaneous
95% CI f
e
BAX® Method
Reference Method
dPOD C
Test Portions
MPN a
Sample Type
Media
X b POD C c
95% CI f
X b POD CC d
95% CI f
Control
5
0 9 3 0
0
(0, 0.43)
0
0
(0, 0.43)
0 0 0 0
(-0.45, 0.45) (-0.14, 0.14) (-0.14, 0.14) (-0.45, 0.45) (-0.28, 0.33) (-0.11, 0.77) (-0.45, 0.45) (-0.14, 0.14) (-0.45, 0.45) (-0.45, 0.45) (-0.14, 0.14) (-0.45, 0.45) (-0.45, 0.45) (-0.25, 0.25)
Peanut butter (25 g)
LB / BHI
0.50 (0.26, 0.88)
20
0.45 0.60
(0.26, 0.66) 9 (0.23, 0.88) 3
0.45 0.60
(0.26, 0.66) (0.23, 0.88)
5.0 (2.7, 8.9)
5 5
Control
0
(0, 0.43)
0
0
(0, 0.43)
Peanut butter (25 g)
BPW / BHI
0.50 (0.26, 0.88)
20
10
0.50
(0.30, 0.70) 9
0.45 0.60
(0.26, 0.66) (0.23, 0.88)
0.050
5.0 (2.7, 8.9)
5 5
5 0
1.0
(0.57, 1.0)
3 0
0.40
Control
0
(0, 0.43)
0
(0, 0.43)
0 0 0 0 0 0 0 0 0
Nonfat Dry Milk
Cocoa (25 g)
1.4 (0.96, 2.4)
20
13
0.65
(0.43, 0.82) 13
0.65
(0.43, 0.82) (0.57, 1.0)
12 (7.0, 19)
5 5
5 0
1.0
(0.57, 1.0)
5 0
1.0
Control
0
(0, 0.43)
0
(0, 0.43)
White pepper (25 g)
TSB
1.3 (0.80, 2.2) 8.3 (4.8, 14)
20
14
0.70
(0.48, 0.85) 14
0.70
(0.48, 0.85) (0.57, 1.0)
5 5
5 0
1.0
(0.57, 1.0)
5 0
1.0
Control
0
(0, 0.43)
0
(0, 0.43)
Infant formula (25 g)
LB
1.8 (1.1, 3.4) 2.0 (1.2, 3.7)
20
16
0.80
(0.58, 0.92) 16
0.80
(0.58, 0.92) (0.57, 1.0)
5 (-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) 5 1.0 (0.57, 1.0) 5 1.0
2 3 4 5 6 7 8 9
b X = Number of positive test portions
c POD C = Confirmed candidate method positive outcomes divided by the total number of trials d POD R = Confirmed reference method positive outcomes divided by the total number of trials = Difference between the candidate method and reference method POD values e dPOD C
f 95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
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