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

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

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