Table 2. Sensitivity analysis results.

Items	Studies	Sample size	Tests for heterogeneity		Analysis model	Test for overall effect		RR/WMD	Favors
		RA/GA	I2	P*		Z	P*	95%CI
Operative Time(min)	[7–14]	398/400	85%	<0.00001	Random	2.63	0.009	-5.55 [-9.68,-1.41]	RA
Tramadol demand(mg)	[7–9,11,12,14]	345/344	96%	<0.00001	Random	5.64	<0.00001	-59.68 [-80.41,-38.94]	RA
Complications
IOH	[8,11]	144/142	41%	0.19	Fixed	2.56	0.01	2.24 [1.21,4.15]	GA
Nausea/Vomiting	[8,10–12,14]	318/318	0%	0.92	Fixed	4.23	<0.0001	0.39 [0.25,0.60]	RA
Fever	[8,11,12]	194/192	5%	0.35	Fixed	1.30	0.19	0.75 [0.48,1.16]	RA
Blood Transfusion	[9–13]	193/190	0%	0.85	Fixed	0.36	0.72**	0.90 [0.52,1.56]	RA
Grade I POC	[10–12]	132/128	46%	0.16	Fixed	0.88	0.38	0.69 [0.30,1.58]	RA
Grade II POC	[10–12]	132/128	0%	0.99	Fixed	0.56	0.58**	0.85 [0.48,1.50]	RA
≥Grade III POC	[11,12]	108/102	0%	0.78	Fixed	1.09	0.27**	0.44 [0.10,1.91]	RA
Total POC	[10–12]	132/128	5%	0.35	Fixed	1.45	0.15	0.74 [0.49,1.11]	RA
Hospital Stay(d)	[8–10,12]	192/198	49%	0.12	Fixed	7.73	<0.00001	-0.59[-0.74,-0.44]	RA
Stone-Free Rate	[8–12]	234/182	0%	0.48	Fixed	0.42	0.68	1.02 [0.93,1.12]	RA

RA: regional anesthesia GA: general anesthesia RR: relative risk WMD: weighted mean difference CI: confidence interval IOH: intraoperative hypotension POC: postoperative complications

* P<0.05 was considered statistically significant.

**originally significant before nRCTs excluded.