Table 2.

Diagnostic accuracy of swab and aspirate samples compared with the reference diagnostic standard of microscopy and/or culture positive (TP, true positive; FP, false positive; FN, false negative; TN, true negative; CI, confidence interval)

Sample type	TP	FP	FN	TN	Sensitivity (95% CI)	Specificity (95% CI)
Swab-Qiagen	78	4	2	21	97.5% (CI 91.2–99.6%)	84% (CI 63.9–95.4%)
Swab-Isohelix	74	4	6	21	92.5% (CI 84.4–97.2%)	84% (CI 63.9–95.4%)
Aspirate-Qiagen	64	2	16	23	80% (CI 69.6–88.1%)	92% (CI 73.9–98.8%)
Aspirate-Boil/Spin	49	1	31	24	61.3% (CI 49.7–71.9%)	96% (CI 79.6–99.3%)