AOAC-RI ERP Book MICRO Sept 2016.pdf

Document 2 of 2 – 3M Petrifilm Salmonella Express PTM Study Report

Table 29. Statistical Analysis (Chi Square) of 3M Salmonella Petrifilm Method Compared to the BAM Method for 1 Detection of Salmonella on Stainless Steel (Independent laboratory Data) 2

3M Petrifilm SALX Method

Total Samples b

Confirmed Positive c

Reference Positive d

Level of Target Control

Presumptive Positive

Relative Sensitivity

False Positive

X 2e

Matrix

-

Stainless Steel

5

0 6

0 6

0 7

-

Low

20

0.11

100

0.0

3 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 e Mantel-Hansezel chi square f Test sensitivity rate is defined as the number of confirmed positive test results divided by the number of test screened positive results, expressed as a percentage. g Test false positive rate is 100 – test specificity rate. Not calculated where the number of samples negative by both methods is 0.

4 5 6 7 8 9

10 11 12 13 14 15