TABLE 3.

Logistic regression analysis of sample accuracy against control growth result for true-susceptible samples

Antibiotic	No. of samples susceptible	No. of samples with correct result	Slope (log odds ratio)	SE	P value
Ampicillin	32	24	4.38	1.86	0.0186
Gentamicin	70	66	3.78	1.22	0.0020
Cephalothin	62	50	5.61	1.67	0.0008
Ciprofloxacin	62	61	1.57	1.71	0.3604
Nitrofurantoin	70	59	2.39	0.77	0.0018
TMP-SMX	56	47	1.89	0.75	0.0115
Vancomycin	9	6	2.00	1.64	0.2238
Total	361	313	2.50a	0.35a	<0.001

^aThe results were obtained by ignoring the antibiotic and pooling all data.