323 / 350
Table 20.
Method Comparison Results for Ready-made Pie at 48 Hours.
1
SD
SD
(S
r
)
(S
r
)
1
<10
<0
<10
<0
2
<10
<0
<10
<0
3
<10
<0
<10
<0
4
<10
<0
<10
<0
5
<10
<0
<10
<0
1
2.0x10
1
1.301
1.0x10
1
1.0000
2
1.0x10
1
1.0000
2.0x10
1
1.301
3
1.0x10
1
1.0000
2.0x10
1
1.301
4
1.0x10
1
1.0000
<10
<0
5
2.0x10
1
1.301
<10
<0
1
1.2x10
2
2.0792
1.0 x 10
3
2.0000
2
1.4 x10
2
2.1461
1.4 x 10
3
2.1461
3
1.2 x10
2
2.0792
1.3 x 10
3
2.1139
4
2.1x10
2
2.3222
1.0 x 10
3
2.0000
5
2.5x10
2
2.3979
2.3 x 10
3
2.3617
1 7.2 x 10
3
3.8573
5.0 x 10
4
3.699
2
7.7 x 10
2
3.8865
6.2 x 10
4
3.7924
3
8.0 x 10
3
3.9031
5.8 x 10
4
3.7634
4
7.6 x 10
2
3.8808
4.9 x 10
4
3.6902
5
8.8 x 10
3
3.9445
5.3 x 10
4
3.7243
High
3.8944 0.0324
3.7339 0.0433 0.0001
Medium
2.2049 0.1467
2.1244 0.1482 0.4128
-
NA
Low
1.1204 0.1649
1.
2007 0.1738 0.537
Uninoculated
-
-
-
Level
Sample
3M RYM Petrifilm
ISO/FDA BAM
p-value
Ct/g
LOG MEAN
Ct/g
LOG MEAN
2
Ready-made Pie 60 hours
3
No statistically significant difference was observed between 2 of the 3 levels analyzed between the two
4
methods. The p-values calculated at a 95% confidence level for the low and medium levels were 0.5370
5
and 0.3651. The t-test indicated a significant difference between the 3M RYM method and the ISO and
6
FDA BAM methods on the high level with a p-value of 0.0001. The 3M RYM method had a higher
7
repeatability value than the ISO and FDA BAM methods for the low, medium, and high levels, with S
r
8
values, respectively, of 0.1399 and 0.1482 for the low level and 0.1649 and 0.1482 for the medium level,
9
and 0.0282 and 0.0433 for the high level. Detailed results are presented in Table 21.
10
11
12
13
14
15
27
AOAC Research Institute
Expert Review Panel Use Only
OMAMAN-16D/ PTM Report
ERP Use Only - December 2014