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