Relationship between body mass index and short-term postoperative prognosis in patients undergoing colorectal cancer surgery

Table 3 Subgroup analysis of indicators of overall complication incidence after surgery

Grouping number	Subgroup grouping method	Subgroup	Number of articles	Effect size	Heterogeneity
					I2 (%)	tau2
1	Geographical location	Europe	6	OR = 1.59, (1.40, 1.80)	0	0
		North America	5	OR = 1.14, (0.94, 1.37)	0	0
		Asia	5	OR = 1.13, (0.84, 1.52)	35.4	0.04
2	Surgery approach	Robotic colorectal surgery	4	OR = 1.18, (0.85, 1.64)	0	0
		Laparoscopic colorectal resection	12	OR = 1.28, (1.08, 1.51)	53.3	0
3	Obese body mass index	30 kg/m2	12	OR = 1.34, (1.14, 1.57)	21.8	0.02
		25 kg/m2	4	OR = 1.14, (0.81, 1.58)	51.3	0.06