Table 2.

Sensitivity, specificity, positive, negative predictive value, and accuracy for good or poor outcome prediction according to BIS cutoff value

BIS Cut-off value		Sensitivity (95% CI)	Specificity (95% CI)	PPV (95% CI)	NPV (95% CI)	Accuracy (95% CI)
For good	> 20.5	87.5 (61.7–98.5)	93.9 (83.1–98.7)	82.4 (60.6–93.4)	95.8 (86.3–98.8)	92.3 (83.0–97.5)
For poor	< 10.5	87.8 (75.2–95.4)	100 (79.4–100)	100	72.7 (55.8–85.0)	90.8 (81.0–96.5)

BIS bispectral index, PPV positive predictive value, NPV negative predictive value, CI confidence interval