TABLE 1.

Sensitivity and Specificity of direct ESwab PCR and Lim broth PCR with the BD Max GBS assay^a

Comparison	ESwab PCR, %		Lim broth PCR, %		ESwab PCR vs Lim broth PCR, %		McNemar test
	Estimate	95% CIb	Estimate	95% CI	Difference	95% CI
Sensitivityc
Same-day ESwab vs Lim broth PCR	92.7 (101/109)	86.2–96.2	99.1 (108/109)	95.0–99.8	−6.4	−12.8 to −1.4	0.0156
24-h ESwab vs Lim broth PCR	97.2 (106/109)	92.2–99.1	99.1 (108/109)	95.0–99.8	−1.8	−6.7 to 2.2	0.5000
Specificityd
Same-day ESwab vs Lim broth PCR	96.7 (291/301)	94.0–98.2	95.0 (286/301)	91.9–97.0	1.7	−0.1 to 3.8	0.0625
24-h ESwab vs Lim broth PCR	96.0 (289/301)	93.2–97.7	95.0 (286/301)	91.9–97.0	1.0	−0.8 to 3.1	0.375

^aLim broth culture is the reference method.

^b95% CI, 95% confidence interval.

^cValues in parentheses represent the ratio of positive results to true positives.

^dValues in parentheses represent the ratio of negative results to true negatives.