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Table 2 Relative deviation of zone diameter values and resulting discrepancies of the Sirscan (on-screen adjusted) and manual calliper measurements

From: Standardisation of disk diffusion results for antibiotic susceptibility testing using the sirscan automated zone reader

  Relative deviation of zone diameters values Discrepancies
(% of all measurements) (% of all Sirscan measurements)
  Sirscan < calliper Sirscan = calliper Sirscan > calliper minor major very major
Gram-negative rods 19 45 36 1.27 0 0
Staphylococcus spp. 27 37 36 0.94 0 0
Enterococcus spp. 53 35 12 0 0 0
  1. For discrepancy analysis manual calliper measurements were regarded as the gold standard. Sirscan values were on-screen adjusted by an experienced person as recommended by the manufacturer.