AOAC-RI ERP Book MICRO Sept 2016.pdf
Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report
Table 28. Statistical Analysis (Chi Square) of 3M Salmonella Petrifilm Method Compared to the USDA/FSIS Method for Detection of 1 Salmonella in Raw Ground Chicken and Pasteurized Liquid Eggs (Independent Laboratory Data) 2
3M Salmonella Petrifilm Method
Relative Sensitivity Rate f
False Positive Rate g
Level of Target Organism MPN/25g a
Total Samples b
Confirmed Positive c
Reference Positive d
Presumptive Positive
X 2e
Matrix
Raw Ground
-
Chicken Control
NA 0.8
5
0
0
0
-
12
12
11
0.1
100
0.0
Low
20
Pasteurized Liquid Eggs
5
-
Control
NA 0.2
0 7
0 7
0 8
-
0.0
20
Low
0.1
100
a Most probable number of colony forming units (cfu)/g food b Number of test assay positive samples not considering subsequent confirmations c Number of test assay positive samples subsequently confirmed d Number of samples positive by reference method eMantel-Hansezel chi square
results, expressed as a percentage. positive reference results
g Test false positive rate is 100 – test specificity rate. Not calculated where the number of samples negative by both methods is 0.
3 4 5 6 7 8 9
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