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3M Petrifilm SALX Collaborative Study
July 2013
OMA-2013-July-XXX
DRAFT DOCUMENT
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7.1.1.4
Cross laboratory probability of detection (LPOD) – LPODs by matrix and
1
concentration with 95% confidence intervals for candidate method
2
(presumptive and confirmed) results.
3
7.1.1.5
Difference of cross-laboratory probability of detection (dLPOD) –
4
difference probability of detection is the difference between any two
5
LPOD values.
6
7.1.1.5.1
Estimate dLPOD
C
as the difference between the candidate
7
and reference LPOD values, include CIs.
8
7.1.1.5.2
Estimate dLPOD
CP
as the difference between the
9
presumptive and confirmed LPOD values, include CIs.
10
7.1.1.5.3
If the CI of a dLPOD does not contain zero then the
11
difference is statistically significant
.
12
7.1.1.6
For each matrix,
graph POD
R
, LPOD
C
and dLPOD
C
by level with 95%
13
confidence intervals.
14
15
8.0
Appendices
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17
8.1
Instructions to Collaborators
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8.2
Test Portion Data Report Forms
19
8.3
Collaborator Comment Form
20
8.4
Study Materials
21
8.5
Flow Diagram – raw ground beef
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8.6
Flow Diagram – dry dog food
23
8.7
Collaborator Information Sheet
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25
26
OMAMAN-08/Collaborative Study Protocol
March 2014
Expert Review Panel Use Only
AOAC Research Institute
Expert Review Panel Use Only