Table 4.

Descriptive statistics of some sociodemographic variables by continent and country

Continent	Country	n	Year of birth (median)	Age at participant's baseline (median)	Female (%)	Primary education or less (%)	Studies involved
Europe	Austria	6411	1945	63	58	14	SHARE
	Belgium	8720	1948	60	55	21	SHARE
	Czech Republic	18092	1946	60	56	14	HAPIEE, SHARE
	Denmark	5553	1948	60	54	13	SHARE
	Estonia	7075	1945	65	59	6	SHARE
	Finland	9673	1948	47	54	47	Health2000
	France	8105	1946	61	57	40	SHARE
	Germany	8690	1946	62	54	2	SHARE
	Greece	6969	1949	55	54	38	ATTICA, SHARE
	Hungary	3076	1948	63	57	2	SHARE
	Ireland	9638	1948	62	46	29	SHARE, TILDA
	Italy	7158	1945	63	55	48	SHARE
	Lithuania	7111	1945	61	55	12	HAPIEE, SHARE
	Luxembourg	1610	1950	62	53	37	SHARE
	Netherlands	6547	1946	61	54	14	SHARE
	Poland	17532	1947	58	54	20	COURAGE, HAPIEE, SHARE
	Portugal	2080	1947	64	57	56	SHARE
	Slovenia	3755	1948	63	56	10	SHARE
	Spain	15952	1944	65	54	58	COURAGE, ENRICA, SHARE
	Sweden	66243	1945	16	50	35	SHARE, UBCoS
	Switzerland	4571	1946	62	55	11	SHARE
	United Kingdom	18489	1944	59	54	38	ELSA
Eurasia	Russia	4947	1946	62	64	9	SAGE
Asia	China	38990	1951	59	53	60	10/66, CHARLS, SAGE
	India	14202	1947	55	61	58	10/66, SAGE
	Israel	3857	1946	61	55	21	SHARE
	Japan	7268	1945	63	52	25	JSTAR
	South Korea	10254	1945	61	56	45	KLOSA
North America	United States of America	37317	1938	56	56	27	HRS
	Cuba	2813	1930	74	65	58	10/66
	Dominican Republic	2011	1931	74	66	90	10/66
	Mexico	28817	1944	59	58	72	10/66, MHAS, SAGE
	Puerto Rico	2009	1932	76	67	44	10/66
South America	Peru	1933	1932	74	61	56	10/66
	Venezuela	1965	1935	71	64	81	10/66
Africa	Ghana	5573	1950	60	49	47	SAGE
	South Africa	4227	1947	60	57	62	SAGE
Oceania	Australia	2087	1914	78	49	36	ALSA
Total		411320	1945	58	54	37	The 17 studies