Table 2. Meta-analysis of short and long-term outcomes.

Outcome of interest	Studies	Participants	OR/WMD	95% CI	P-value	I2 (%)
Clinicopathologic features
Male gender	3	1231	0.58	0.46, 0.75	<0.001	0
Age	4	1470	0.10	-1.28, 1.47	0.10	40
Body mass index	2	695	-0.26	-1.26, 0.74	0.62	0
Preoperative anemiaa	2	775	2.51	1.83, 3.45	<0.001	0
ASA > 2	2	748	1.15	0.59, 2.24	0.69	76
Extended or major resection	4	1470	1.64	1.28, 2.09	<0.001	0
Duration of surgery (min)	2	775	55.64	42.14, 69.14	<0.001	0
Blood loss (mL)	4	1470	726.88	376,91, 1076.84	<0.001	93
Tumor size (cm)	2	695	0.95	-0.13, 2.03	0.09	78
Tumor number	2	695	-0.03	-0.49, 0.44	0.90	59
Negative surgical margin	4	1470	1.03	0.70, 1.51	0.89	0
Postoperative outcomes
Overall morbidity	6	2833	1.98	1.49, 2.33	<0.001	51
Major complication	4	2226	2.12	1.26, 3.58	0.005	76
Mortality	5	2821	4.13	1.96, 8.72	<0.001	51
Length of stay (day)	3	2099	4.42	1.15, 7.69	0.008	82
Long-term outcomes
Overall survival	21	8732	1.24	1.11, 1.38	0.0002	71
Disease-free survival	11	5018	1.38	1.23, 1.56	<0.001	17

Abbreviations: OR=odds ratio, WMD=weighted mean difference, CI= confidence interval,

ASA= American Society of Anesthesiologists