Each box plot represents the relation

Figure 4: Each box plot represents the relation to the maximum, the minimum, the mean (

), the median (-) as well as the Inter-Quartile range (

) of the C_t values for each lab, error bars represent the lowest and the highest C_t value. Also shown are the extreme values (o). The line with (-

-) is the reference lab for ISA at AVC median C_t value and the line with (-

-) represents the overall median for all laboratories.