Meta‐analysis on hazard ratios for tumour recurrence in the laparoscopic group
Study	Hazard ratio (HR)	Ln(HR)	Var(Ln(HRi))
COST 2004	0.86	‐0.151	0.025
Lacy 2002	0.72	‐0.329	0.039
Leung 2004	1.24	0.219	0.06
Liang 2007	1.29	0.2528	0.077