TABLE 3.

Reproducibility of Etest

Antibiotic	No. of isolates evaluated	Categorical results		Reliability coefficientc for MICs
		Agreementa	Kappa indexb
RIF	20	95 (19/20)	0.79	0.9628
INH	20	80 (16/20)	0.57	0.9609
EMB	20	85 (17/20)	0.63	0.9244
STR	24	79 (19/24)	0.56	0.8802

^aAgreement of categorical results in the repeats by Etest, expressed as percent (number of repeats in agreement/total repeats). 

^bValues above 0.4 are considered reproducible and beyond chance (9). 

^cAs the value approaches 1, the test is more reliable (6).