TABLE 1:

Normal reference values for mean MCA and ICA blood flow velocities by age group

Mean Velocity (cm/s)	Age Group				Between-Group Differences
Mean Velocity (cm/s)	All	I (<40 y)	II (40–60 y)	III (>60 y)	Between-Group Differences
All subjects (n = 304)
MCA	71 (35–107)^**	78 (44–112)	70 (36–104)	57 (32–82)	I vs II^†, II vs III^†, I vs III^†
ICA	39 (18–60)^**	43 (28–61)	38 (16–60)	33 (16–50)	I vs II^†, II vs III^†, I vs III^†
Women (n = 193)
MCA	75 (39–111)^**	80 (45–115)^‡	74 (41–107)	58 (31–85)	II vs III^†, I vs III^†
ICA	42 (20–64)^*	45 (28–62)^‡	42 (17–67)	31 (12–50)	I vs II^†, II vs III^†, I vs III^†
Men (n = 111)
MCA	64 (32–96)^**	71 (40–102)	65 (32–98)	56 (31–81)	I vs III^†
ICA	34 (20–48)^*	35 (21–49)	34 (20–48)	34 (20–48)	Not significant

* Age dependence, P < .05.
** Age dependence, P < .001.
† All P < .05.
‡ Sex dependence, P < .05.