Table 3.

Predictive values of pupil diameter variations for insufficient analgesia (BPS)

	10 mA tetanic stimulation	20 mA tetanic stimulation	40 mA tetanic stimulation
Best cutoffs for pupil diameter variation (%)	1	5	13
Sensitivity	0.69 (0.55 – 0.84)	0.85 (0.74 – 0.96)	0.85 (0.74 – 0.96)
Specificity	0.67 (0.52 – 0.81)	0.74 (0.61 – 0.88)	0.78 (0.65 – 0.91)
Positive predictive value	0.50 (0.35 – 0.66)	0.61 (0.46 – 0.76)	0.65 (0.50 – 0.80)
Negative predictive value	0.82 (0.70 – 0.94)	0.91 (0.82 – 1.00)	0.91 (0.83 – 1.00)
Youden index	0.36	0.59	0.62

All data except Youden index were 95% confidence interval. BPS Behavioral Pain Scale.