Characteristics of the sample

Category of PVWMH	No. of Subjects	Smokers		Hyper-tension		Diabetes		Hyper-cholesterolemia		History of Cardiov. Disease		History of Cerebrov. Disease
Category of PVWMH	No. of Subjects	No.	%	No.	%	No.	%	No.	%	No.	%	No.	%
Thin white line	273	143	52.38	120	43.96	30	10.99	103	37.73	74	27.11	32	11.72
Thick rim	233	127	54.51	126	54.08	26	11.16	106	45.49	62	26.61	44	18.88
Extended PVWMH	90	47	52.22	50	55.56	6	6.67	48	53.33	24	26.67	30	33.33
Subtle extended PVWMH	69	35	52.24	31	46.27	5	7.46	21	31.34	18	26.87	9	13.43
Total	665	352	52.93	327	49.17	67	10.08	278	41.80	178	26.77	115	17.29