Table 3. Pooled estimates of multivariate analysis for overall survival in patients with ⩾10 CLM.

Variables	HR	Lower CI	Upper CI	P
Max tumour size ⩾40 mm	1.49	1.09	2.03	0.02
Age ⩾60 years	1.51	1.13	2.00	0.005
Preoperative MRI	0.65	0.47	0.89	0.007
R0/R1 resection	0.35	0.26	0.48	<0.0001
Adjuvant chemotherapy	0.73	0.55	0.98	0.04

Abbreviations: CI=confidence interval; CLM= colorectal liver metastases; HR=hazards ratio; MRI=magnetic resonance imaging.