Table 2.

Incidence and severity of PONV within 48 hours after surgery

Parameters	OFA (n=86)	Control (n=88)	RR (95% CI)	P value
PONV (%)	22 (25.6)	29 (33.0)	0.78 (0.49, 1.23)	0.285*
PONV on the first day (%)	15 (17.4)	24 (27.3)	0.64 (0.36, 1.12)	0.120*
Severity of PONV on the first day	0 (0, 8)	0 (0, 8)		0.168*
Antiemetic medication on the first day (%)	8 (9.3)	5 (5.7)	1.64 (0.59, 4.61)	0.364*
PONV on the second day (%)	13 (15.1)	14 (15.9)	0.95 (0.48, 1.88)	0.885*
Severity of PONV on the second day	0 (0, 7)	0 (0, 9)		0.566*
Antiemetic medication on the second day (%)	2 (2.3)	5 (5.7)	0.41 (0.09, 1.78)	0.260*

*Data shown as mean±SD and compared using Student’s t-test.

OFA, opioid-free anaesthesia; PONV, postoperative nausea and vomiting; RR, relative risk.