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a
MPN = Most Probable Number is based on the POD of reference method test portions across labs using the AOAC MPN calculator, with 95% confidence
244
interval
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b
N = Number of test potions
246
c
x = Number of positive test portions
247
d
POD
C
=
Confirmed candidate method positive outcomes divided by the total number of trials
248
e
POD
R
= Confirmed reference method positive outcomes divided by the total number of trials
249
f
dPOD
C
= Difference between the candidate method and reference method POD values
250
g
95% CI = If the confidence interval of a dPOD does not contain zero, then the difference is statistically significant at the 5% level
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References:
272
PTM Certification Modification Report