Table 3. Postoperative opioid use in patients receiving either intraoperative or postoperative ketamine infusion.

Postoperative PCA data	No ketamine used	Ketamine used	P value
Intraoperative ketamine (dose ≥2.4 mg/kg)
Postoperative PCA use, mean mg/kg	0.13 (0.11)	0.11 (0.12)	0.608
Postoperative PCA duration, mean hours	12.3 (2.4)	13.3 (4.0)	0.373
Postoperative PCA given/attempts	0.60 (0.31)	0.58 (0.31)	0.852
Postoperative ketamine (duration ≥48 hours)
Postoperative PCA use, mean mg/kg	0.12 (0.118)	0.12 (0.124)	0.919
Postoperative PCA duration, mean hours	12.5 (3.4)	12.4 (3.6)	0.938
Postoperative PCA given/attempts	0.62 (0.324)	0.56 (0.318)	0.585