Table 1.

Study population characteristics.

Characteristic	Rotterdam Study (N = 4472)	AGES- Reykjavik (N = 1350)
Age, in years	64.8 ± 10.8	79.7 ± 4.7
Men, N (%)	1981 (44.3%)	513 (38.0%)
Intracranial volume, in cm3	1141.4 ± 114.9	1485.8 ± 144.0
Brain volume, in cm3	937.5 ± 100.9	1060.3 ± 97.1
Flow rate, in cm3/s
Basilar artery	1.7 ± 0.6	1.0 ± 0.74
Left carotid	3.5 ± 0.9	2.9 ± 1.0
Right carotid	3.5 ± 0.9	3.0 ± 1.0
Vessel cross-sectional area, in cm2
Basilar artery	0.29 ± 0.05	0.24 ± 0.06
Left carotid	0.35 ± 0.07	0.35 ± 0.07
Right carotid	0.36 ± 0.07	0.36 ± 0.08
Flow velocity, in cm/s
Basilar artery	11.2 ± 4.3	7.5 ± 2.9
Left carotid	15.2 ± 4.6	10.2 ± 2.8
Right carotid	14.9 ± 4.5	10.4 ± 3.1

Note: Values represent mean ± standard deviation, unless otherwise stated.