Variations of author origins in World Journal of Gastroenterology during 2001-2007

Table 1 Co-author articles published in WJG during 2001-2007

Yr	Distribution of co-author articles											Total (articles)	Authors	Cooperation degree	Cooperation rate (%)
	1	2	3	4	5	6	7	8	9	10	> 11
2001	9	18	20	33	26	20	20	14	5	2	6	173	884	5.11	94.80
2002	2	20	23	44	35	39	30	20	10	2	11	236	1313	5.56	99.15
2003	7	30	65	88	131	110	79	55	25	22	21	633	3637	5.75	98.89
2004	12	47	82	112	146	154	105	71	43	25	29	826	4755	5.76	98.55
2005	13	59	113	188	243	273	202	154	86	56	109	1496	9434	6.31	99.13
2006	46	111	149	169	210	191	150	119	74	57	106	1382	8160	5.90	96.67
2007	48	107	129	148	158	139	120	83	48	59	66	1105	6232	5.64	95.66
Total	137	392	581	782	949	926	706	516	291	223	348	5851	34415	5.88	97.66

Table 2 Geographical distribution of the authors in WJG

Yr	Distribution of the authors in 6 continents
	Africa	Asia	Europe	North America	Oceania	South America
2001	0	136	32	4	0	0
2002	0	227	6	2	1	0
2003	1	575	45	6	2	3
2004	3	713	85	6	0	5
2005	7	1111	314	28	4	11
2006	11	712	453	110	10	23
2007	9	555	359	93	13	14

Table 3 Distribution of the top 15 countries in WJG during 2001-2007

Country name	2001	2002	2003	2004	2005	2006	2007	Total
China	136	227	548	669	884	380	320	3164
Japan			6	19	133	170	117	445
Germany	10	2	4	10	68	92	66	252
Italy			9	15	56	79	56	215
United States	4	2	5	6	19	77	81	194
Turkey			17	24	31	43	62	177
South Korea			5	9	37	53	38	142
Greece			2	6	34	45	31	118
United Kingdom	18		3	1	16	28	22	88
India			5	2	7	35	30	79
Spain			1	2	13	34	21	71
Poland		1	2	6	31	17	4	61
Hungary			2	12	20	20	5	59
Iran			2	2	7	25	18	54
Thailand			1	4	14	16	13	48

Table 4 Data comparisons of the 4 representative gastroenterology journals in 2007

Journal name	Articles published in 2007	Cooperation degree in 2007	Cooperation rate in 2007	Geographical distribution of authors	Ratio of articles contributed by domestic authors (%)
Am J Gastroenterol	565	4.77	95.40	44	United States 47.43
Gastroenterology	586	6.14	84.18	35	United States 50.85
Scand J Gastroenterol	238	5.95	96.63	42	Sweden 18.07
WJG	1118	5.64	95.66	62	China 30.4