Micro December 2018

Table 14. Matrix study: 3M Petrifilm Rapid E. coli /Coliform Count Plate vs ISO 4832:2006 – Total coliform count 1

3M Petrifilm Rapid E. coli /Coliform Count Plate

ISO 4832:2006

95% CI g

Cont. level a Low Med High Low Med High Low Med High Low Med High Low Med High Low Med High Low Med High Low Med High Low Med

Matrix

Mean b 1.801 2.721 4.823 1.862 2.887 4.865 2.852 3.725 4.415 1.850 2.801 4.877 1.979 2.887 4.852 1.866 2.852 4.814 2.760 3.568 4.420 1.912 2.887 4.887 1.891 2.890

s r

RSD r

Mean 1.852 2.724 4.823 1.866 2.891 4.869 2.846 3.695 4.449 1.842 2.795 4.882 1.932 2.898 4.863 1.902 2.859 4.828 2.771 3.572 4.446 1.924 2.900 4.886 1.924 2.890

s r

RSD r

Mean diff. f

LCL h

UCL i

c

d

0.077 0.112 0.104 0.098 0.076 0.067 0.077 0.092 0.061 0.095 0.077 0.067 0.066 0.076 0.077 0.067 0.077 0.078 0.062 0.054 0.075 0.045 0.076 0.076 0.046 0.046

4.275 4.116 2.156 5.263 2.632 1.377 2.700 2.470 1.382 5.135 2.749 1.374 3.335 2.632 1.587 3.591 2.700 1.620 2.246 1.513 1.697 2.354 2.632 1.555 2.433 1.592

0.077 0.107 0.089 0.067 0.083 0.055 0.079 0.135 0.042 0.062 0.098 0.061 0.059 0.059 0.077 0.039 0.077 0.068 0.045 0.062 0.032 0.028 0.065 0.075 0.028 0.046

4.158 3.928 1.845 3.591 2.871 1.130 2.776 3.654 0.944 3.366 3.506 1.249 3.054 2.036 1.583 2.050 2.693 1.408 1.624 1.736 0.720 1.455 2.241 1.535 1.455 1.592

-0.051 -0.003 0.000 -0.004 -0.004 -0.004 0.006 0.029 -0.034 0.008 0.006 -0.005 0.047 -0.011 -0.011 -0.037 -0.007 -0.014 -0.011 -0.004 -0.026 -0.012 -0.013 0.001 -0.033 0.000

-0.140 -0.066 -0.022 -0.107 -0.039 -0.033 -0.045 -0.039 -0.069 -0.079 -0.029 -0.024 -0.028 -0.036 -0.036 -0.144 -0.029 -0.037 -0.034 -0.046 -0.080 -0.067 -0.028 -0.018 -0.092 -0.021

0.038 0.061 0.022 0.098 0.032 0.025 0.058 0.098 0.001 0.095 0.041 0.014 0.122 0.014 0.014 0.071 0.014 0.009 0.013 0.038 0.027 0.044 0.002 0.019 0.025 0.021

Raw ground beef (73% lean) Raw frozen chicken wings

Raw milk

Whole liquid egg

Tuna sushi

Smoked salmon

Bunched spinach

Pasteurized carrot juice

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