156 / 471
Table 2014.1A
:Summary of Results for the Detection of
Listeria
in
Full Fat Cottage Cheese
(25g)
1
Method
a
3M
™
MDA
™
Listeria
Inoculation Level
Uninoculated
Low
High
Candidate Presumptive
Positive/
Total # of Samples Analyzed
1/132
67/132
132/132
Candidate Presumptive POD
(CP)
0.01
(0.00, 0.04)
0.51
(0.42, 0.60)
1.00
(0.97, 1.00)
s
r
b
0.09
(0.08, 0.16)
0.51
(0.45, 0.52)
0.00
(0.00, 0.16)
s
L
c
0.00
(0.00, 0.04)
0.00
(0.00, 0.17)
0.00
(0.00, 0.16)
s
R
d
0.09
(0.08, 0.10)
0.51
(0.46, 0.52)
0.00
(0.00, 0.23)
P Value
e
0.4338
0.8931
1.0000
Candidate Confirmed Positive/
Total # of Samples Analyzed
0/132
64/132
132/132
Candidate Confirmed POD
(CC)
0.00
(0.00, 0.03)
0.48
(0.40, 0.57)
1.00
(0.97, 1.00)
s
r
b
0.00
(0.00, 0.16)
0.51
(0.45, 0.52)
0.00
(0.00, 0.16)
s
L
c
0.00
(0.00, 0.16)
0.00
(0.00, 0.15)
0.00
(0.00, 0.16)
s
R
d
0.00
(0.00, 0.23)
0.51
(0.46, 0.52)
0.00
(0.00, 0.23)
P Value
e
1.0000
0.8762
1.0000
Positive Reference Samples/
Total # of Samples Analyzed
0/132
73/132
132/132
Reference POD
0.00
(0.00, 0.03)
0.55
(0.47, 0.64)
1.00
(0.97, 1.00)
s
r
b
0.00
(0.00, 0.16)
0.50
(0.45, 0.52)
0.00
(0.00, 0.16)
s
L
c
0.00
(0.00, 0.16)
0.00
(0.00, 0.18)
0.00
(0.00, 0.16)
s
R
d
0.00
(0.00, 0.23)
0.50
(0.45, 0.52)
0.00
(0.00, 0.23)
P Value
e
1.0000
0.6678
1.0000
dLPOD (Candidate vs.
Reference)
f
0.00
(-0.03, 0.03)
-0.07
(-0.19, 0.06)
0.00
(-0.03, 0.03)
dLPOD (Candidate
Presumptive vs. Candidate
Confirmed)
f
0.01
(-0.02, 0.04)
0.01
(-0.12, 0.13)
0.00
(-0.03, 0.03)
a
Results include 95% Confidence Intervals,
r
Repeatability Standard Deviation,
c
Among-Laboratory Standard Deviation,
d
Reproducibility Standard Deviation
2
e
P Value = Homogeneity test of laboratory PODs;
f
A confidence interval for dLPOD that does not contain the value 0 indicates a statistical significant difference between
3
the two methods
4
5
6
Candidates for 2016 Method of the Year
128