High peak inspiratory pressure may be associated with intraoperative coughing during neurosurgery under general anesthesia without neuromuscular blockade: a retrospective study

Table 4 Receiver operating characteristic analysis

	Before propensity score matching					After propensity score matching
	AUC (95% CI)	P value	Optimal cutoff value	Sensitivity	Specificity	AUC (95% CI)	P value	Optimal cutoff value	Sensitivity	Specificity
PIP (cmH₂O)	0.66 (0.56–0.76)	0.003	21.6	46.7%	81.3%	0.71 (0.60–0.83)	0.007	21.6	92.9%	51.5%
TV/PBW (mL/kg)	0.65 (0.54–0.75)	0.006	7.9	46.7%	77.2%	0.66 (0.51–0.80)	0.047	7.9	57.1%	72.1%
Surgical duration (min)	0.65 (0.56–0.73)	0.006	169.5	80.0%	50.2%	0.69 (0.57–0.81)	0.015	200.5	78.6%	61.1%

AUC, area under the curve; CI, confidence interval; PIP, peak inspiratory pressure; TV/PBW, tidal volume divided by predicted body weight

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