Table 4. Network indicators for documents on psoriasis research indexed in Medline.

Indicator	1942–1953	1954–1963	1964–1973	1974–1983	1984–1993	1994–2003	2004–2013
N vertices	279	963	3,045	5,476	8,634	11,705	24,858
Average degree	1.53	2.13	2.89	4.13	5.2	7.11	10.97
Size of the largest component. N vertices (%)	10 (3.58%)	16 (1.66%)	140 (4.60%)	1336 (24.40%)	4353 (50.42%)	6870 (58.69%)	18151 (73.02%)
% isolates	46.55%	27.59%	16.23%	8.30%	3.62%	2.23%	1.23%
Density	0.00551817	0.00221717	0.0009494	0.00075421	0.00060206	0.0006074	0.0004414
Watts-Strogatz Clustering Coefficient	0.88496732	0.8906824	0.86428218	0.87325918	0.88338413	0.89705532	0.8886843
N links with value = 1	194	904	3,805	9,483	19,135	36,320	113,615
N links with value > 1	20	123	595	1,823	3,303	5,288	22,751
Average distance	1.29	1.45	4.3	8.29	8.12	6.18	5.25