Table 2.

Observed Data for Perioperative Period in Two Groups (n=75)

	OBA Group (n=75)	OFA Group (n=75)	P-value
Butorphanol (mg)	2.5 (2.25–2.75)	2.25 (1.75–2.5)*	< 0.001
Time of LMA removed (min)	6 (5–8)	12 (10–14)*	< 0.001
Recovery time of orientation (min)	9 (7–10)	27 (25–29)*	< 0.001
Time to unassisted walking (h)	3 (2–4)	3 (2–5)	0.272
Waking up			0.414
Yes, n(%)	9 (12)	6 (8)
No, n(%)	66 (88)	69 (92)
Time to first flatus (h)	18 (16–20)	16 (13–20)*	0.029
Incidence of PONV, n (%)	11 (14.7)	10 (13.3)	0.814
GSS	3 (3–4)	3 (3–4)	0.978

Notes: Data are in median (IQR), or number (proportion). *P < 0.05 vs OBA group.

Abbreviations: OBA, opioid-based anesthesia; OFA, opioid-free anesthesia; LMA, laryngeal mask airway; PONV, postoperative nausea and vomiting; GSS, global satisfaction score; IQR, interquartile range.