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Table M: 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
Raw Ground
Chicken
25 g
Salmonella
enterica ser.
Heidelberg
NCTC
g
5717
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
11
0.55
0.34, 0.74
0.25
-0.04, 0.49
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Raw Ground
Chicken
325 g
Salmonella
enterica ser.
Heidelberg
NCTC 5717
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
15
0.75
0.53, 0.89
11
0.55
0.34, 0.74
0.20
-0.25, 0.41
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Raw Ground
Beef
25 g
Salmonella
enterica ser.
Anatum
ATCC
h
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
14
0.70
0.48, 0.85
14
0.70
0.48, 0.85
0.00
-0.27, 0.27
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Raw Ground
Beef
325 g
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
15
0.75
0.53, 0.89
14
0.70
0.48, 0.85
0.05
-0.22, 0.31
High
5
5
1.00
0.57, 1.00
5
1.00
0.57, 1.00
0.00
-0.43, 0.43
Raw Ground
Beef
375 g
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
15
0.75
0.53, 0.89
14
0.70
0.48, 0.85
0.05
-0.22, 0.31
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
NCTC- National Collection of Type Cultures
h
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