Table 1. Performance characteristics of the 7-SNP test for detecting Escherichia coli in urine samples.

	Standardized culture result
7-SNP test result or performance characteristic	Any E. coli (N = 306)	≥ 103 cfu/ml E. coli (N = 259)
Positive (N = 274)	267	257
Negative (N = 476)	39	2
Sensitivity a, %	87.3 (83.0–90.8)	99.2 (97.2–99.9)
Specificity a, %	98.4 (96.8–99.4)	96.5 (94.5–98.0)
PPV a, %	97.5 (94.8–99.0)	93.8 (90.3–96.3)
NPV a, %	91.8 (89.0–94.1)	99.6 (98.5–99.9)

^a 95% confidence intervals are given in parenthesis after point estimate.