Five-year long-term outcomes of laparoscopic surgery for colon cancer

Table 1 Characteristics of included studies (laparoscopic vs open group)

Ref.	Age (yr, median)	Localisation of the tumour	Follow-up	Analyzed (n)
COST 2007[16]	70/69	Right/left/sigmoid colon	5 yr	863
Lacy 2008[15]	68/71	Right/left/sigmoid colon	95 mo	219
COLOR 2009[14]	71/71	Right/left/sigmoid colon	53 mo	1076

Table 2 Quality assessment: internal validity of the included randomized trials

Ref.	Randomization allocation	Concealment of allocation	Blinding	Intention-to-treat analysis	Withdrawal and dropouts
COST 2007[16]	Yes	Not clear	Not clear	Yes	Clear report
Lacy 2008[15]	Yes	Adequate	Not clear	Yes	Clear report
COLOR 2009[14]	Yes	Not clear	Not clear	Yes	Clear report