AOAC 2019 First Action Methods

Table 2019.02B. Collaborative Study Results of MC-Media Pad ® RAC vs. SMEDP

MC-Media Pad ® RAC

SMEDP

Difference of Means d 95% LCL, UCL -0.053, 0.013 0.008, 0.043

Difference of Means b,c

Mean Log 10 CFU/g 2.311 3.766

Mean Log 10 CFU/g 2.331 3.740

Matrix

Lot

N

s R

Lot

N

s R

s r

s r

a

a

Yogurt Drink (24 Hours) Yogurt Drink (48 Hours)

Low

9 9

0.29 0.08

0.29 0.12

Low

9 9

0.09 0.06

0.12 0.12

-0.020 0.026

Medium

Medium

High

9

4.266

0.10

0.16

High

9

4.266

0.09

0.15

-0.001

-0.032, 0.030

Low

9 9

2.329 3.785

0.12 0.07

0.12 0.11

Low

9 9

2.331 3.740

0.09 0.06

0.12 0.12

-0.002 0.045

-0.029, 0.025 0.028, 0.062

Medium

Medium

High

9

4.278

0.10

0.16

High

9

4.266

0.09

0.15

0.012

-0.023, 0.047

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