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
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