AOAC RI ERP Final Action Recommendations - BOOK

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= 0, CI: -0.28 to 0.28). There was no significant difference between the LPT method and 1
the reference method using unpaired Chi-square test (X2 = 0.40) or the POD (dPOD = 2
0.10, CI: -0.37 to 0.19). See Tables 5, 8, 9 in the Appendix 3
Vanilla ice cream 4
For the vanilla ice cream analysis there were 18 confirmed positives for the LPT method 5
and 15 confirmed positives for the AOAC reference method. All uninoculated samples 6
were negative with both methods. There were no false positives for the VIDAS method 7
(dPOD = 0, CI: -0.21 to 0.21). There was no significant difference between the LPT 8
method and the reference method using unpaired Chi-square test (X2 = 1.52) or the POD 9
(dPOD = 0.15, CI: -0.09 to 0.38). See Tables 6, 8, 9 in the Appendix. 10
Queso fresco – 25g 11
For the queso fresco (25g) analysis there were 9 confirmed positives for the LPT method 12
and 11 confirmed positives for the AOAC reference method. All uninoculated samples 13
were negative with both methods. There were no false positives for the VIDAS method 14
(dPOD = 0, CI: -0.28 to 0.28). There was no significant difference between the LPT 15
method and the reference method using unpaired Chi-square test (X2 = 0.39) or the POD 16
(dPOD = 0.10, CI: -0.37 to 0.19). See Tables 6, 8, 9 in the Appendix. 17
Queso fresco - 125g 18
For the queso fresco (125g) analysis there were 11 confirmed positives for the LPT 19
method and 11 confirmed positives for the AOAC reference method. All uninoculated 20
samples were negative with both methods. There were no false positives for the VIDAS 21
method (dPOD = 0, CI: -0.28 to 0.28). There was no significant difference between the 22
LPT method and the reference method using unpaired Chi-square test (X2 = 0) or the POD 23
(dPOD = 0, CI: -0.28 to 0.28). See Tables 6, 8, 9 in the Appendix. 24
Ceramic tile 25
For the ceramic analysis there were 6 confirmed positives for the LPT method and 3 26
confirmed positives for the USDA reference method. All uninoculated samples were 27
negative with both methods. There were no false positives for the VIDAS method (dPOD 28
= 0, CI: -0.27 to 0.27). There was no significant difference between the LPT method and 29
the reference method using unpaired Chi-square test (X2 = 1.26) or the POD (dPOD = 30
0.15, CI: -0.11 to 0.39. See Tables 7, 8, 9 in the Appendix. 31
Stainless steel 32
For the stainless steel analysis there were 10 confirmed positives for the LPT method and 33
1 confirmed positives for the USDA reference method. All uninoculated samples were 34
negative with both methods. There was one false positives for the VIDAS method (dPOD 35
= 0.45, CI: -0.24 to 0.33). There was a significant difference between the LPT method 36
and the reference method using unpaired Chi-square test (X2 = 11.61) and the POD 37
(dPOD = 0.45, CI: 0.18 to 0.65). See Tables 7, 8, 9 in the Appendix. 38
Plastic (polypropylene) 39
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