Intraoperative laparoscopic ultrasound-guided resection and microwave ablation for colorectal liver metastases

Table 1 Comparison of baseline characteristics between the two groups (mean ± SD)

Group	n	Gender (n)		Age (years)	Body mass index (kg/m2)	Number of liver metastases		Primary tumor location
		Male	Female			Single	Multiple	Rectal cancer	Colon cancer
Control	150	74	76	59.60 ± 2.15	19.52 ± 0.77	81	69	79	71
Observation	150	77	73	59.98 ± 2.74	19.49 ± 0.83	83	67	76	74
t/χ²		0.120		1.336	0.325	0.054		0.120
P value		0.729		0.183	0.746	0.817		0.729