AOAC 2019 First Action Methods
Table 2019.02A. Collaborative Study Results of MC-Media Pad ® RAC vs. USDA MLG 3.02
Difference of Means d 95% LCL, UCL
Difference of Means b,c
MC-Media Pad ® RAC
USDA MLG 3.02
Mean Log 10 CFU/g
Mean Log 10 CFU/g
Matrix
Lot
N a
s R
Lot
N
s R
s r
s r
a
Raw Ground Pork (24 Hours) Raw Ground Pork (48 Hours)
Low
9 3.438 0.08 0.12 9 4.768 0.07 0.14
Low
9 9
3.423 0.16 4.754 0.09
0.18 0.16
0.015 0.014
-0.038, 0.068 -0.013, 0.042
Medium
Medium
High
9 5.313 0.12 0.17
High
9
5.322 0.08
0.16
-0.008
-0.054, 0.037
Low
9 3.465 0.09 0.13 9 4.782 0.08 0.14
Low
9 9
3.423 0.16 4.754 0.09
0.18 0.16
0.042 0.029
-0.018, 0.101 0.005, 0.052
Medium
Medium
High
9 5.354 0.11 0.15
High
9
5.322 0.08
0.16
0.032
-0.001, 0.066
a Number of laboratories that reported complete results. b Mean Log 10 Candidate method – Mean Log 10 Reference method c A 95% confidence interval for the true mean difference within +0.5 indicates equivalence of the two methods d 95% Lower and Upper Confidence Limits
s r – Repeatability Standard Deviation s R – Reproducibility Standard Deviation
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