364-365 / 596
24
Table 2016.2A (cont’d.)
: Comparative Results for the Detection of
Listeria
in 125 g Deli Turkey Test Portions by the 3M
™
MDA 2 -
Listeria
Method vs.
1
USDA/FSIS MLG Chapter. 8.09 in a Collaborative Study (Low Inoculum Level)
2
Statistic
Matrix/
Inoculation
Level
Laboratory
Candidate presumptive
(CP)
Candidate confirmed (CC)
Candidate result (C)
Reference method (R)
C vs. R
N
X
POD
(CP)
N
X
POD
(CC)
N
X
POD
(C)
N
X
POD
(R)
dLPOD
(C,R)
dLPOD
(CP,CC)
Deli
Turkey
1
12
7
0.58
12
7
0.58
12
7
0.58
12
6
0.50
0.08
0.00
2
12
7
0.58
12
6
0.50
12
6
0.50
12
5
0.42
0.08
0.08
3
12
4
0.33
12
4
0.33
12
4
0.33
12
5
0.42
-0.08
0.00
4
12
5
0.42
12
5
0.42
12
5
0.42
12
4
0.33
0.08
0.00
5
12
6
0.50
12
6
0.50
12
6
0.50
12
6
0.50
0.00
0.00
6
12
7
0.58
12
7
0.58
12
7
0.58
12
6
0.50
0.08
0.00
7
12
7
0.58
12
7
0.58
12
7
0.58
12
6
0.50
0.08
0.00
8
a
NA NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
9
12
8
0.66
12
8
0.66
12
8
0.66
12
6
0.50
0.16
0.00
10
a
NA NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
MPN/
Test
Portion
0.63
0.49
0.80
11
12
7
0.58
12
6
0.50
12
6
0.50
12
7
0.58
-0.08
0.08
12
12
5
0.42
12
5
0.42
12
5
0.42
12
4
0.33
0.08
0.00
13
12
5
0.42
12
5
0.42
12
5
0.42
12
5
0.42
0.00
0.00
Estimate
All
132
68
0.52
132
66
0.50
132
66
0.50
132
60
0.45
0.04
0.02
LCL
0.43
0.41
0.41
0.37
-0.08
-0.11
UCL
0.60
0.59
0.59
0.54
0.17
0.14
s
r
b
0.51
0.51
0.51
0.51
LCL
0.45
0.46
0.46
0.46
UCL
0.52
0.52
0.52
0.52
s
L
c
0.00
0.00
0.00
0.00
LCL
0.00
0.00
0.00
0.00
UCL
0.15
0.14
0.14
0.11
s
R
d
0.51
0.51
0.51
0.51
UCL
0.46
0.46
0.46
0.46
LCL
0.52
0.52
0.52
0.52
P
T
e
0.8762
0.9123
0.9123
0.9829
a
N/A – Laboratory did not participate or submit data for this matrix
3
b
Repeatability Standard Deviation,
c
Among-Laboratory Standard Deviation,
d
Reproducibility Standard Deviation,
e
P
T
Value = Homogeneity test of laboratory PODs
4
LCL – Lower Confidence Limit; UCL – Upper Confidence Limit
, N = number of samples tested, X = number of test samples with a positive result (presumptive or confirmed)
5
6
7
8