A bibliometric analysis in the fields of preventive medicine, occupational and environmental medicine, epidemiology, and public health

Table 2 Data regarding the worldwide research production in the "Epidemiology" subcategory.

	1995	1996	1997	1998	1999	2000	2001	2002	2003	Total number of articles for the whole period	Percentage of worldwide production (articles)	Mean impact factor of all articles	Total product for the whole period *	Total product/gross domestic product †	Total product/millions of population
USA	663	691	724	681	821	896	976	815	839	7,106	44.0	2.8	20,029	26.1	71.3
Canada	64	70	73	66	107	93	92	76	91	732	4.5	2.4	1776	29.5	58.4
Western Europe	621	634	664	686	694	754	814	649	784	6,300	39.0	2.0	12,347	13.7	31.8
Japan	21	19	26	22	35	36	48	32	36	275	1.7	2.3	643	1.3	5.1
Oceania	39	51	45	46	56	51	52	68	69	477	3.0	2.2	1,049	22.4	34.6
Asia	43	67	65	69	57	84	73	75	104	637	3.9	2.1	1,321	4.1	0.4
Eastern Europe	19	20	20	24	17	31	26	11	40	208	1.3	1.3	266	2.7	0.6
Central and Latin America	25	21	17	18	31	31	50	36	42	271	1.7	2.1	558	3.3	1.1
Africa	16	17	14	16	27	15	22	18	20	165	1.0	1.7	280	5.7	0.4
TOTAL (or average)	1,511	1,590	1,648	1,628	1,845	1,991	2,153	1,780	2,025	16,171	-	-	-	(13.1)	-

* Defined as the product of articles multiplied by the corresponding impact factor of their journal
† Total product (defined by the number of articles multiplied by the impact factor of the journal) divided by gross domestic product in tens of trillions of 1995 US dollars

ISSN: 1471-2458