Table 1. Bibliometric indicators of production and collaboration for documents on psoriasis research indexed in the Medline database.

Decade	N docs	N authors	% authors with 1 doc	% authors with >9 docs	N signatures	Co-author mean	N docs (journal articles)	N authors (journal articles)	N signatures (journal articles)	Co-author mean (Journal articles)
1942–1953	459	522	83.14	0.00	647	1.41	459	522	647	1.41
1954–1963	1,070	1,330	79.25	0.30	1,867	1.74	1,064	1,327	1,861	1.75
1964–1973	2,896	3,635	74.25	0.85	5,998	2.07	2,747	3,561	5,753	2.09
1974–1983	4,219	5,972	70.34	1.99	11,189	2.65	3,764	5,643	10,259	2.72
1984–1993	4,877	8,958	71.67	1.58	16,410	3.36	3,873	7,946	13,889	3.59
1994–2003	5,096	11,972	73.93	1.56	21,208	4.16	3,490	10,018	16,777	4.81
2004–2013	10,053	25,168	71.86	2.46	51,961	5.17	6,490	20,483	38,708	5.96
TOTAL	28,670	48,899	69.39	2.85	109,280	3.81	21,887	42,157	87,894	4.01