160-161 / 471
Table 2014.2A (cont’d.)
: Comparative Results for the Detection of
Listeria
in Full Fat Cottage Cheese (4% Milk Fat) by the 3M
™
MDA
Listeria
Method vs.
1
AOAC OMA 993.12 in a Collaborative Study (Low Level)
2
Statistic
MPN/
Test Portion 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)
0.80
0.63
1.00
1
12
6
0.50
12
4
0.33
12
4
0.33
12
6
0.50
-0.17
0.17
2
12
7
0.58
12
7
0.58
12
7
0.58
12
7
0.58
0.00
0.00
3
12
8
0.67
12
7
0.58
12
7
0.58
12
7
0.58
0.09
0.00
4
a
NA NA
NA
NA NA
NA
NA NA
NA
NA NA
NA
NA
NA
5
a
NA NA
NA
NA NA
NA
NA NA
NA
NA NA
NA
NA
NA
6
a
12
7
0.58
12
12
1.00
12
7
0.58
12
2
0.17
0.41
-0.42
7
12
4
0.33
12
4
0.33
12
4
0.33
12
10
0.83
-0.50
0.00
8
12
7
0.58
12
7
0.58
12
7
0.58
12
7
0.58
0.00
0.00
9
12
4
0.33
12
4
0.33
12
4
0.33
12
8
0.67
0.34
0.00
10
12
6
0.50
12
6
0.60
12
6
0.60
12
7
0.58
0.08
0.00
11
12
6
0.50
12
6
0.60
12
6
0.60
12
5
0.42
0.08
0.00
12
12
6
0.50
12
6
0.50
12
6
0.50
12
5
0.42
0.08
0.00
13
a
12
5
0.42
12
7
0.58
12
5
0.42
12
7
0.58
0.00
-0.16
14
12
6
0.50
12
6
0.50
12
6
0.50
12
6
0.50
0.00
0.00
15
12
7
0.58
12
7
0.58
12
7
0.58
12
5
0.42
0.16
0.00
Estimate
All
132 67
0.51
132 64
0.48
132 64
0.48
132 73
0.55
-0.07
0.01
LCL
0.42
0.40
0.40
0.47
-0.19
-0.12
UCL
0.60
0.57
0.57
0.64
0.06
0.13
s
r
b
0.51
0.51
0.51
0.50
LCL
0.45
0.45
0.45
0.45
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
0.17
0.15
0.15
0.18
s
R
d
0.51
0.51
0.51
0.50
UCL
0.46
0.46
0.46
0.45
LCL
0.52
0.52
0.52
0.52
P
T
e
0.8931
0.8762
0.8762
0.6678
a
Results were not used in statistical analysis due to deviation from testing protocol
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;
NA- laboratory results were not received
5
6
7
Candidates for 2016 Method of the Year
131