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There were no statistically significant differences at the 5% level in log transformed means
1
between the 3M Petrifilm RYM Count Plate and FDA BAM/ISO 21257 methods, at any of the
2
three contamination levels.
3
4
3M RYM Count Plate incubated at 28
o
C and enumerated at 60 hours
5
6
The mean log
10
counts of the 3M Petrifilm RYM Count Plate and FDA BAM/ISO 21527
7
results were compared statistically. One (1) laboratory in the FDA BAM/ISO 21527 low
8
contamination level was identified as an outlier as defined by the Cochran’s tests for outliers.
9
However, no evidence of physical cause or suspicion of cause was noted and it was determined
10
that they would be included in the statistical analysis.
11
There were no statistically significant differences determined between the 3M Petrifilm RYM
12
Count Plate and FDA BAM/ISO 21527 methods at the 95% level or between the differences of
13
means at all three contamination levels.
14
15
Raw Almonds
16
17
Raw almond test portions were inoculated at a low, medium and high contamination level and
18
were analyzed (Tables 6-9) for the enumeration of yeast and mold. Uninoculated controls were
19
included in each analysis. Fifteen laboratories participated in the analysis of this matrix.
20
21
3M RYM Count Plate incubated at 25
o
C and enumerated at 48 hours
22
23
The mean log
10
counts of the 3M Petrifilm RYM Count Plate and FDA BAM/ISO 21527
24
results were compared statistically. One (1) laboratory was identified in the 3M Petrifilm RYM
25
Count Plate medium contamination results as an outlier by the Cochran’s test for outliers,
26
one laboratory was identified in the FDA BAM/ISO 21527 high contamination level as an outlier
27
by the Single Grubbs’ test and two laboratories in the 3M Petrifilm RYM Count Plate high
28
contamination level were identified as an outlier by the double Grubbs’ test for outliers.
29
However, no evidence of physical cause or suspicion of cause was noted and it was determined
30
that they would be included in the statistical analysis.
31
There were no statistically significant differences at the 5% level in log transformed means
32
between the 3M Petrifilm RYM Count Plate and FDA BAM/ISO 21257 methods, at any of the
33
three contamination levels.
34
3M RYM Count Plate incubated at 25
o
C and enumerated at 60 hours
35
36
The mean log
10
counts of the 3M Petrifilm RYM Count Plate and FDA BAM/ISO 21527
37
results were compared statistically. One (1) laboratory was identified in the FDA BAM/ISO
38
21527 high contamination level as an outlier by the Single Grubbs’ test and two laboratories in
39
the 3M Petrifilm RYM Count Plate high contamination level were identified as an outlier by the
40
double Grubbs’ test for outliers. However, no evidence of physical cause or suspicion of cause
41
was noted and it was determined that they would be included in the statistical analysis.
42
There were no statistically significant differences determined between the 3M Petrifilm RYM
43
Count Plate and FDA BAM/ISO 21527 methods at the 95% level or between the differences of
44
means at all three contamination levels.
45
46
3M RYM Count Plate incubated at 28
o
C and enumerated at 48 hours
47
48
Candidates for 2016 Method of the Year
83