324 / 350
Table 21.
Method Comparison Results for Ready-made Pie at 60 Hours.
1
2
3
Sandwiches 48 hours
4
No statistically significant difference was observed between 2 of the 3 levels analyzed between the two
5
methods. The p-values calculated at a 95% confidence level for the low and medium levels were 0.6033
6
and 0.4879. The t-test indicated a significant difference between the 3M RYM method and the ISO and
7
FDA BAM methods on the high level with a p-value of 0.0290. The 3M RYM method had a higher
8
repeatability value than the ISO and FDA BAM methods for the high level, with S
r
values, respectively, of
9
0.0494 and 0.1363. The ISO and FDA BAM methods had a higher repeatability values than the 3M RYM
10
method for the low and medium levels, with S
r
values, respectively, of 0.2270 and 0.2692 for the low
11
level and 0.0522 and 0.1535 for the medium level. Detailed results are presented in Table 22.
12
Table 22 .
Method Comparison Results for Sandwiches at 48 Hours.
13
SD
SD
(S
r
)
(S
r
)
1
2.0 x10
1
1.301
4.0x10
1
1.6021
2
4.0 x10
1
1.6021
3.0 x10
1
1.4771
3
4.0x10
1
1.6021
2.0 x10
1
1.301
4
4.0x10
1
1.6021
2.0 x10
1
1.301
5
1.0x10
1
1.0000
1.0x10
1
1.0000
1
3.6 x10
2
2.5563
2.7x10
2
2.4314
2
3.2 x10
2
2.5051
2.7x10
2
2.4314
3
1.6 x10
2
2.2041
2.5 x10
2
2.3979
4
2.6 x10
2
2.415
2.6 x10
2
2.415
5
1.8 x10
2
2.2553
3.4 x10
2
2.5315
1 1.1 x 10
4
4.0414
1.1 x 10
4
4.0414
2
1.1 x 10
4
4.0414
1.4 x 10
4
4.1461
3
9.1 x 10
3
3.959
2.6 x 10
4
4.415
4
1.1 x 10
4
4.0414
1.6 x 10
4
4.2041
5
8.8 x 10
3
3.9445
1.6 x 10
4
4.2041
ISO/FDA BAM
p-value
Ct/g
LOG MEAN
Ct/g
LOG MEAN
Low
1.4214 0.2692
1.3362
Level
Sample
3M RYM Petrifilm
0.227 0.6033
Medium
2.3872 0.1535
2.4414 0.0522 0.4879
High
4.0055 0.0494
4.2021 0.1363 0.029
14
15
Sandwiches 60 hours
16
No statistically significant difference was observed between 2 of the 3 levels analyzed between the two
17
methods. The p-values calculated at a 95% confidence level for the low and medium levels were 0.6033
18
28
AOAC Research Institute
Expert Review Panel Use Only
OMAMAN-16D/ PTM Report
ERP Use Only - December 2014