Table 7.

Test of agreement for susceptibility classification by E test and agar dilution by κ method

Antimicrobial agentκ statistic (±95% confidence interval)
Interclass methodaIntraclass methodb
Agar dilutionE test
Penicillin0.81 (0.72–0.88)0.75 (0.68–0.82)0.72 (0.64–0.78)
Cefuroxime0.79 (0.73–0.84)0.73 (0.68–0.78)0.72 (0.69–0.81)
Cefotaxime0.75 (0.70–0.80)0.79 (0.74–0.84)0.73 (0.68–0.79)
Vancomycinc
  • a Compares E test to agar dilution.

  • b Compares consecutive E tests and agar dilutions.

  • c —, Comparison could not be made because all isolates were sensitive.