The coefficient of variation of repeatability (in hours) averages 5.1 070 for the on-MPCA method and 3.6 % for the in-MPCA method. For this second method, the standard deviation of repeatability expressed in CFU/ml is lower than the generally admitted value for the reference standard plate counts (sr = 0.07) and it is nearly constant at the various levels of milk contamination. But for the on-MPCA method, this standard deviation becomes proportionally higher as the level of milk contamination decreases.
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