Table 1.

Showing level of evidence and level of anastomoses in different RCTs

Study (Ref)	Level of evidence	Level of anastomoses
Hoffman, 1986 [36]	IIb	Supraperitoneal
Johnson, 1989 [39]	IIb	Colocolic, colorectal, ileocolic, ileoanal, coloanal
Hagmueller, 1990 [35]	IIb	Colocolic, colorectal, ileocolic,
Sagar, 1993 [33]	Ib	Colocolic, colorectal, ileocolic, ileoanal, ileorectal
Sagar, 1995 [38]	IIb	Pelvic (colorectal, coloanal, ileoanal, ileorectal)
Merad, 1998 [12]	Ib	Suprapromontory (colocolic, colorectal, ileocolic)
Merad, 1999 [34]	Ib	Pelvic (colorectal, coloanal)
Brown, 2001 [37]	IIb	Infraperitoneal (colorectal, coloanal)