Species Dilution Sample % Sample % Sample %
Variation coefficient >25% Spike recovery<50% Spike recovery>200%
Human(n=933) 1/10 39 8 21
Mice (n=80) 1/40 35 30 3
Rat (n=221) 1/20 26 9 11
Table 1: Proportion of samples (%) presenting a high variation coefficient (>25%) and/or spike recovery out of the acceptable range (<50% or >200%).