Robotic versus laparoscopic Gastrectomy for gastric cancer: a systematic review and updated meta-analysis

BMC Surgery

Table 7 Results of the subgroup analysis of weight

Outcomes	No. of studies	Sample size		Heterogeneity (P, I ²)	Overall effect size	95% CI of overall effect	P
Outcomes	No. of studies	LG	RG	Heterogeneity (P, I ²)	Overall effect size	95% CI of overall effect	P
Operation time (min)
non-overweight	2	232	127	0.06, 72%	WMD = −37.63	−62.82 ~ −12.43	<0.01
overweight	2	118	44	0.008, 86%	WMD = −28.58	−79.11 ~ 21.94	0.27
Blood loss (mL)
non-overweight	2	232	127	0.11, 60%	WMD =0.90	−13.44 ~ 15.25	0.90
overweight	2	118	44	0.03, 80%	WMD =39.84	−41.71 ~ 121.39	0.34
Retrieved lymph nodes
non-overweight	2	232	127	0.34, 0%	WMD = −1.88	−4.78 ~ 1.01	0.20
overweight	2	118	44	0.03, 79%	WMD =4.32	−4.10 ~ 12.74	0.31

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