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 13. BAX® System vs. Reference Method Results – Environmentals
95% CI f
e
BAX® Method
Reference Method
dPOD C
CFU/ sample
Test Portions
Sample Type Media
X b POD C c
95% CI f
X b POD CC d
95% CI f
Control
5
0 9 5 0 6 5 0
0
(0, 0.43)
0
0
(0, 0.43)
0 0 0 0 0 0 0 0 0 0 0 0
(-0.45, 0.45) (-0.14, 0.14) (-0.14, 0.14) (-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) (-0.14, 0.14) (-0.45, 0.45)
LB
Ceramic tile
60
20
0.45
(0.26, 0.66) 9
0.45
(0.26, 0.66) (0.57, 1.0)
600
5 5
1.0
(0.57, 1.0)
5 0
1.0
Control
0
(0, 0.43)
0
(0, 0.43)
Ceramic tile
BPW
60
20
0.30
(0.15, 0.52) 6
0.30
(0.15, 0.52) (0.57, 1.0)
600
5 5
1.0
(0.57, 1.0)
5 0
1.0
Control
0
(0, 0.43)
0
(0, 0.43)
LB
Plastic
107
20
13
0.65
(0.43, 0.82) 13
0.65
(0.43, 0.82) (0.57, 1.0)
1070
5 5
5 0
1.0
(0.57, 1.0)
5 0
1.0
Control
0
(0, 0.43)
0
(0, 0.43)
Plastic
BPW
107
20
11
0.55
(0.34, 0.74) 11
0.55
(0.34, 0.74) (0.57, 1.0)
1070
5
5
1.0
(0.57, 1.0)
5
1.0
2 3 4 5 6 7 8
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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