Micro December 2018

e U.S. Food and Drug Administration Bacteriological Analytical Manual , Chapter 4, Enumeration of Escherichia coli and the Coliform Bacteria. 1 f Mean difference between the candidate and reference methods. 2 g Confidence interval based on paired statistical analysis. 3 h 95% Lower confidence limit for difference of means. 4 i 95% Upper confidence limit for difference of means. 5 k Uncontaminated matrix sample. 6 7 8 9 Table 13. Matrix study: 3M Petrifilm Rapid E. coli /Coliform Count Plate vs BAM Chapter 4 – E. coli count 10

3M Petrifilm Rapid E. coli /Coliform Count Plate

BAM e Chapter 4

95% CI g

Cont. level a Un k Low Med High Low Med High Low Med High Low Med High Un Un Un

Matrix

Mean b 0.000 1.506 2.382 3.377 0.000 2.243 2.942 3.937 0.000 1.891 2.489 3.672 0.000 1.608 2.372 3.208 0.000 2.817

s r

RSD r

Mean 0.000 1.358 2.397 3.359 0.000 1.996 2.878 3.835 0.000 1.666 2.423 3.414 0.000 1.565 2.442 3.222 0.000 2.862

s r

RSD r

Mean diff. f

LCL h

UCL i

c

d

NA

NA

NA

NA

NA

NA

NA

0.119 0.240 0.246 0.134 0.246 0.043 0.226 0.375 0.303 0.175 0.108 0.100 NA NA NA

7.927 10.06 7.269 5.958 8.365 2.096 11.95 15.07 8.254 10.91 4.543 3.125 NA NA NA

0.215 0.205 0.194 0.195 0.187 0.192 0.078 0.238 0.172 0.218 0.083 0.193 NA NA NA

15.86 8.535 5.787 9.764 6.499 5.006 4.693 9.830 5.039 13.93 3.415 5.999 NA NA NA

0.148 -0.015 0.018 0.248 0.064 0.103 0.225 0.066 0.259 0.043 -0.071 -0.014 NA NA NA

0.021 -0.262 -0.264 0.108 -0.323 -0.138 -0.028 -0.317 0.070 -0.296 -0.177 -0.235 NA NA NA

0.289 0.194 0.259 0.391 0.418 0.334 0.468 0.414 0.435 0.385 0.035 0.235 NA NA NA

Pasteurized whole milk

Butter

Dry milk powder

Raw ground pork

Un

NA

NA

NA

NA

NA

NA

NA

Lamb chop

Low

0.015

0.537

0.072

2.498

-0.045

-0.138

0.047

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