Table 1.

Branching of SMA and relationship of SMA branches to SMV.

Branching variant	Russian group (n = 130)	Chinese group (n = 130)	P
RCA
Present (arises as a separate trunk from SMA)	40	58	0.020
Absent (absent or arises from either ICA or MCA)	90	72
MCA
Present	130	128	0.156
Absent	0	2
ICA related to SMV
Type I	47	67	0.012
Type II	83	63
SMA branches related to SMV
Type Ia	33	40	0.335
Type Ib	14	25	0.057
Type Ic	0	2	0.156
Type IIa	57	32	0.002
Type IIb	7	6	0.776
Type IIc	19	25	0.322

Types Ia, Ib, Ic, IIa, IIb, and IIc are defined according to the description in the text. ICA: Ileocolic artery; MCA: Middle colic artery; RCA: Right colic artery; SMA: Superior mesenteric artery; SMV: Superior mesenteric vein.