Systematic review of oncological outcomes following laparoscopic vs open total mesorectal excision

Table 3 Quality variables reported in the included trials

Ref.	Randomization	Power calculations	ITT	Blinding	Concealment
Araujo et al[32]	Not reported	Not reported	Not reported	Not reported	Not reported
Baraga et al[33]	Computer generated	Yes	Yes	Yes	Sealed blinded envelops
Gong et al[34]	Not reported	Not reported	Not reported	Not reported	Not reported
Guillou et al[35]	Random allocation with 2 to 1 ratio	Yes	Yes	Not reported	Allocation communicated by telephone
Jayne et al[36]	Random allocation with 2 to 1 ratio	Yes	Yes	Not reported	Allocation communicated by telephone
Kang et al[37]	Computer generated with block permutation	Yes	Yes	Yes	Allocation communicated by telephone
Lujan et al[38]	Computer generated	Yes	Yes	Yes	Sealed blinded envelops
Ng et al[39]	Computer generated random sequence	Yes	Yes	Yes	Concealed by theatre coordinator
Ng et al[40]	Computer generated	Yes	Yes	Not reported	Not reported
Ng et al[41]	Computer generated random sequence	Yes	Yes	Yes	Concealed by theatre coordinator
Zhou et al[42]	Not reported	Not reported	Not reported	Not reported	Not reported

ITT: Intention-to-treat.