Table 1.

Characteristics of WMH samples and percent (and number) with history of stroke.

Country	Field dates	Age range	Sample size		Response rate (%)	History of stroke
			Part 1	Part 2 sub-sample		Number unweighted (N)	Weighted (%)
Americas
Colombia	2003	18–65	4426	2381	87.7	8	0.2
Mexico	2001–2	18–65	5782	2362	76.6	4	0.1
United States	2002–3	18+	9282	5692	70.9	140	2.7
Peru	2005–6	18–65	3930	1801	90.2	14	0.8
Asia and South Pacific
Japan	2002–6	20+	4129	1682	55.1	29	1.8
New Zealand	2003–4	18+	12,790	7312	73.3	181	2.6
Europe
Belgium	2001–2	18+	2419	1043	50.6	11	0.7
France	2001–2	18+	2894	1436	45.9	14	1.3
Germany	2002–3	18+	3555	1323	57.8	29	2.4
Italy	2001–2	18+	4712	1779	71.3	16	0.9
The Netherlands	2002–3	18+	2372	1094	56.4	17	1.3
Spain	2001–2	18+	5473	2121	78.6	20	0.4
Northern Ireland	2004–7	18+	4340	1986	68.4	23	1.2
Portugal	2008–9	18+	3849	2060	57.3	42	2.1
Romania	2005–6	18+	2357	2357	70.9	57	1.9
Poland	2010–11	18–64	10,081	4000	50.4	26	0.5
Middle East
Israel	2002–4	21+	4859	4859	72.6	83	1.5
Weighted average response rate (%)					77.2
Total sample size			87,250	45,288		714	1.5