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Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 25. 3M Petrifilm SALX Method Comparison POD Results for Liquid Whole Egg (Internal Data)
1
x
c
POD
C
d
95% CI
x
POD
R
e
95% CI
Pasteurized
Liquid
Whole Egg
Salmonella
0
5
0
0
0.00 - 0.43
0
0
0.00 - 0.43
0 -0.43 – 0.43
Vs.
USDA/FSIS-
Enteritidis
0.32 (0.14-
0.56)
20
6
0.3
0.15-0.52
4
0.2 0.08 – 0.42 0.1 -0.17 – 0.35
ATCC
0
5
0
0
0.00 - 0.43
0
0
0.00 - 0.43
0 -0.43 – 0.43
13076
0.32 (0.14-
0.56)
20
6
0.3
0.15-0.52
4
0.2 0.08 – 0.42 0.1 -0.17 – 0.35
g
95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
Reference Method
dPOD
CP
f
95% CI
g
18 Hr
Primary
Enrichment
–
24 Hr
Primary
Enrichment
–
a
MPN = Most Probable Number is based on the POD of reference method test portions across labs using the AOAC MPN calculator with 95%
Matrix Time Point
Strain MPN
a
/100g N
b
3M Petrifilm SALX Method
b
N = Number of test potions
c
x = Number of positive test portions
d
POD
C
=
Candidate method confirmed positive outcomes divided by the total number of trials
e
POD
R
= Reference method confirmed positive outcomes divided by the total number of trials
f
dPOD
C
= Difference between the candidate method confirmed results and candidate method confirmed result POD values
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16