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Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 26. 3M Petrifilm SALX Method Comparison POD Results for Dry Dog Food and Stainless Steel (Internal Data)
1
X
c
POD
C
d
95% CI
x
POD
R
e
95% CI
Dry Dog
Food
Salmonella
0
5
0
0
0.00 - 0.43
0
0
0.00 - 0.43
0
-0.43 –
0.43
Vs.
FDA/BAM
Poona
0.03 (0.01-
0.68)
20
16
0.8 0.58 - 0.92
14
0.7 0.48 - 0.85 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
4840
0.03 (0.01-
0.68)
20
16
0.8 0.58 - 0.92
14
0.7 0.48 - 0.85 0.1
-0.17 –
0.35
Stainless
Steel
Salmonella
0
5
0
0
0.00 - 0.43
0
0
0.00 - 0.43
0
-0.43 –
0.43
Vs.
FDA/BAM
Kahla
51
20
6
0.3 0.15 – 0.52
7
0.35 0.18 – 0.57 -0.05
-0.32 –
0.23
ATCC
0
5
0
0
0.00 - 0.43
0
0
0.00 - 0.43
0
-0.43 –
0.43
17980
51
20
6
0.3 0.15 – 0.52
7
0.35 0.18 – 0.57 -0.05
-0.32 –
0.23
18 Hr
Primary
Enrichment
Matrix Time Point
Strain
MPN
a
/
325g or
CFU
100cm
2
Reference Method
dPOD
C
f
95% CI
g
18 Hr
Primary
Enrichment
24 Hr
Primary
Enrichment
N
b
3M Petrifilm SALX Method
f
dPOD
C
= Difference between the candidate method confirmed results and candidate method confirmed result POD values
g
95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
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% confidence interval
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
2
3
4
5
6
7
8
9
10