Micro December 2018
1
Table 2018.1A Interlaboratory Study Results of 3M Petrifilm Rapid E. coli /Coliform Count Plate vs. FDA BAM Chapter 4
3M Petrifilm Rapid E. coli /Coliform Count Plate - Coliform (35 o C)
FDA BAM Chapter 4 Coliform
Difference of Means b
Difference of Means c 95% LCL, UCL
Mean Log 10 CFU/g
Mean Log 10 CFU/g
Matrix
Lot
N a
s r
s R
Lot
N a
s r
s R
Uninoculated
9 9 9 9 9 9 9 9
0.000 1.645 2.687 3.458 0.000 1.422 2.298 3.236
0.00 0.22 0.12 0.10 0.00 0.22 0.12 0.14
0.00 0.25 0.16 0.17 0.00 0.31 0.26 0.22
Uninoculated
9 9 9 9 9 9 9 9
0.000 1.617 2.660 3.474 0.000 1.448 2.292 3.219
0.00 0.18 0.10 0.12 0.00 0.20 0.11 0.15
0.00 0.31 0.12 0.17 0.00 0.32 0.22 0.17
0.00 -0.28 -0.28 0.02 0.00 0.02 -0.01 -0.02
0.00, 0.00 -0.20, 0.14 -0.09, 0.03 -0.06, 0.10 0.00, 0.00 -0.17, 0.22 -0.12, 0.11 -0.14, 0.10
Low
Low
Dry Pet Kibble
Medium
Medium
High
High
Difference of Means b
Difference of Means c 95% LCL, UCL
3M Petrifilm Rapid E. coli /Coliform Count Plate – E. coli (35 o C)
FDA BAM Chapter 4 E. coli
Uninoculated
Uninoculated
Low
Low
Dry Pet Kibble
Medium
Medium
High
High
a Number of collaborators that reported complete results. b ADifference of means <0.5 indicates no statistically significant difference between methods c 95% Lower and Upper Confidence Limits s r – Repeatability s R – Reproducibility
2 3
17
Made with FlippingBook HTML5