Table 3.

Statistical summary of the secondary angle β, defined between the parent vessel segment and smaller daughter segment

Parent Segment	Smaller Daughter Segment
	Order 9	Order 10	Order 11
RCA
Order 9	76.3±18.4 (7)	575.5 (1)	55.9±15.0 (3)
Order 10		63.4±31.7 (67)	57.9±14.7 (15)
Order 11			63.0±34.2 (32)
LAD
Order 9	64.1±33.0 (26)	65.2±20.3 (9)	46.7±25.8 (10)
Order 10		75.5±32.5 (81)	61.4±17.7 (23)
Order 11			75.3±30.1 (36)
LCx
Order 9	72.4±30.3 (44)	57.0±16.0 (11)
Order 10		74.6±36.5 (36)

Values are means ± SD (in °); numbers in parentheses are numbers of measurements made. Shown are the averages and SDs for each group of bifurcations determined by the radius of the parent vessel segment and the daughter vessel segment. The number of measurements made for each order is the same as those shown in Table 2.