The erratic mitochondrial clock: variations of mutation rate, not population size, affect mtDNA diversity across birds and mammals

Table 3 Effects of life-history variables and bird (n = 196) vs. mammal (n = 500) status (referred as Class) on mtDNA substitution rate.

Model	Variable	Effect	t value	P
(A) Body mass + Class
	Body mass	-0.25	-8.9	<0.01
	Class (Mammals)	0.22	3.1	<0.01
	Body mass: Class (Mammals)	0.13	4.4	<0.01
(B) Maximum longevity + Class
	Maximum longevity	-0.65	-9.4	<0.01
	Class (Mammals)	0.31	2.5	0.01
	Maximum longevity: Class (Mammals)	0.04	0.5	0.65

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