Table 4.

Results of center subgroup.

	Single center						Multicenter
Subgroup	Number of studies	Number of patients	I2 (%)	Overall effect size	95% CI of overall effect size	P	Number of studies	Number of patients	I2 (%)	Overall effect size	95% CI of overall effect size	P
Operating time (min)	8	1448	75	SMD=0.23	[−0.01, 0.48]	0.06	11	3054	23	SMD=−0.03	[−0.11, 0.06]	0.56
Blood loss (ml)	7	968	91	SMD=−0.27	[−0.75, 0.21]	0.27	10	2944	71	SMD=−0.3	[−0.45, −0.16]	<0.01
Pringle applied	4	1188	98	OR=0.34	[0.03, 3.68]	0.38	12	3211	67	OR=0.93	[0.69, 1.24]	0.61
Pringle duration (min)	5	902	39	SMD=−0.13	[−0.32, 0.06]	0.18	8	2062	90	SMD=0.05	[−0.25, 0.36]	0.74
Hospital stay (days)	7	1307	39	SMD=−0.04	[−0.19, 0.12]	0.65	11	2612	47	SMD=0.03	[−0.09, 0.14]	0.63

SMD/OR, standard mean difference/odds ratio; statistically significant results are shown in bold.