Table 2.

Intraoperative remifentanil and total opioid doses in each group before and after propensity score-matching

	Before matching			After matching
	Ketamine (+) n=129	Ketamine (–) n=121	P- value	Ketamine (+) n=89	Ketamine (–) n=89	P- value
Remifentanil dose; µg/kg/min	0.15 ± 0.05	0.17 ± 0.05	0.01*	0.15 ± 0.06	0.17 ± 0.05	0.03*
Total opioid dose; µg/kg/min	0.17 ± 0.06	0.19 ± 0.06	0.03*	0.17 ± 0.06	0.19 ± 0.06	0.03*

The total opioid dose corresponds to the sum of the remifentanil and fentanyl doses. Values are presented as means ± standard deviations.

*P <0.05