Comparison of Postoperative Events between Spinal Anesthesia and General Anesthesia in Laparoscopic Cholecystectomy: A Systemic Review and Meta-Analysis of Randomized Controlled Trials

Table 2

Power analysis of the studies.

Study	VAS (2 h)	VAS (4 h)	VAS (8 h)	VAS (24 h)	PONV (24 h)	Urine retention (24 h)
Bessa et al., 2010 [4]	70%	37%	NA	5%	64%	8%
Bessa et al., 2012 [1]	100%	100%	32%	NA	NA	NA
Kalaivani et al., 2014 [12]	100%	100%	99%	33%	15%	21%
Tzovaras et al., 2008 [11]	NA	100%	95%	97%	8%	27%
Ellakany, 2013 [13]	NA	67%	91%	98%	NA	NA
Tiwari et al., 2013 [10]	NA	NA	NA	100%	82%	19%
Imbelloni et al., 2010 [14]	NA	NA	NA	NA	18%	NA

NA: not available.