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Table 3
Pearson's correlation coefficients (bold text) and their significancea (regular text) of different evolutionary events
	Family		Domain		Universal Families		Universal Domains
	Birth	Death	Birth	Death	Duplication	Deletion	Duplication	Deletion
Family birth		-0.58	0.59	-0.57	0.48	-0.15	0.54	-0.24
		0.016	0.012	0.017	0.050	0.553	0.024	0.355
Family death			-0.40	0.87	-0.33	0.64	-0.41	0.72
			0.108	4.5E-06	0.200	0.005	0.102	0.001
Domain birth				-0.38	0.91	-0.01	0.93	-0.05
				0.135	3.70E-07	0.969	8.3E-08	0.862
Domain death					-0.37	0.45	-0.42	0.50
					0.139	0.072	0.096	0.043
Universal Families duplication						0.05	0.96	0.10
						0.838	4.5027E-10	0.716
Universal Families deletion							0.06	0.93
							0.821	4.5E-08
Universal Domains duplication								0.04
								0.872
Universal Domains deletion

^a Significance of Pearson's correlation coefficient was tested using t-distribution.

Wang et al. BMC Evolutionary Biology 2012 12:138 doi:10.1186/1471-2148-12-138

Table 3