Table 4.

Clustering information of the antioxidant capacity of the bioactive substances in microalgae.

Cluster ID	Size	Silhouette	The average research periods [Year]
0	233	0.821	2018
1	113	0.868	2008
2	103	0.872	2011
3	95	0.838	2012
4	83	0.85	2016
5	59	0.935	2015
6	51	0.885	2015
7	45	0.965	2005
8	44	0.969	2005
9	38	0.97	2017
12	21	0.991	2004
15	11	1	2002
17	10	1	2009
25	6	0.997	2018