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Table E: 3M
™
MDA
Salmonella
vs. Reference Method– POD Results
Matrix
Analyte
Inoculum Level
N
a
3M
™
MDA
Salmonella
Reference Method
dPOD
C
e
95% CI
f
X
b
POD
C
c
95% CI
x
POD
r
d
95% CI
Processed
American Cheese
Salmonella
enterica
ser. Montevideo
ATCC
g
8387
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
16
0.80
0.58, 0.92
13
0.65
0.43, 0.82
0.15
-0.12, 0.40
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Concrete
Salmonella
enterica
ser. Enteritidis
ATCC 13076
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
9
0.45
0.26, 0.66
11
0.55
0.34, 0.74
-0.10
-0.37, 0.19
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Creamy Peanut
Butter
Salmonella
enterica
ser. Typhimirium
ATCC 14028
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
10
0.50
0.30, 0.70
9
0.45
0.26, 0.66
0.05
-0.24, 0.33
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Sprout Irrigation
Water
Salmonella
enterica
ser. Saintpaul
ATCC 9712
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
10
0.50
0.30, 0.70
10
0.50
0.30, 0.70
0.00
-0.28, 0.28
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Dry Pet Food
375g
Salmonella
enterica
ser. Poona
NCTC 4840
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
7
0.35
0.18, 0.57
5
0.25
0.11, 0.47
0.10
-0.18, 0.36
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Ceramic Tile
Salmonella
enterica
ser. Anatum
ATCC 9270
Un-inoculated
5
0
0.00
0.00, 0.43
0
0.00
0.00, 0.43
0.00
-0.43, 0.43
Low
20
10
0.50
0.30, 0.70
10
0.50
0.30, 0.70
0.00
-0.28, 0.28
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
a
N = Number of test portions
b
x = Number of positive test portions
c
POD
C
=
Candidate method confirmed positive outcomes divided by the total number of trials
d
POD
r
= Reference method confirmed positive outcomes divided by the total number of trials
e
dPOD
C
= 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
g
ATCC = American Type Culture Collection
2013.09 /PTM Matrix Extension Report
March 2014
Expert Review Panel Use Only
AOAC Research Institute
Expert Review Panel Use Only