Validation of Simple Methods to Select a Suitable Nostril for Nasotracheal Intubation

Table 4

Diagnostic value of the occlusion test, spatula test, and two tests combined (series test and parallel test).

	Sensitivity	Specificity	Predictive value		Likelihood ratio
			Positive	Negative	Positive	Negative
Occlusion test	91.7	61.1	75.9	84.6	2.36	0.14
	(95% CI: 80.0–97.7)	(95% CI: 43.5–76.9)	(95% CI: 62.8–86.1)	(95% CI: 65.1–95.6)	(95% CI: 1.55–3.58)	(95% CI: 0.05–0.36)
Spatula test	95.8	25.0	63.0	81.8	1.28	0.17
	(95% CI: 85.7–99.5)	(95% CI: 12.1–42.2)	(95% CI: 50.9–74.0)	(95% CI: 48.2–97.7)	(95% CI: 1.05–1.56)	(95% CI: 0.04–0.73)
Series test	87.9	70.8	80.1	81.4	3.01	0.17
	(95% CI: 78.6–97.1)	(95% CI: 56.0–85.7)	(95% CI: 68.1–92)	(95% CI: 69.5–93.3)	(95% CI: 1.82–4.99)	(95% CI: 0.08–0.38)
Parallel test	99.7	15.3	61.1	97.0	1.18	NA
	(95% CI: 98.0–100)	(95% CI: 3.5–27.0)	(95% CI: 50.2–71.9)	(95% CI: 83.5–100)	(95% CI: 1.02–1.36)