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Table 2 Phylogenetically-controlled regression analyses

From: Selective constraints on protamine 2 in primates and rodents

Clade Dependent value Independent value n Slope t R2 λ p
cleaved-Prm2
 Primates cleaved-Prm2 ω log body mass 12 0.02 0.23 0.14 1(ns,ns) 0.82
log testes mass 0.60 0.83 0.43
 Rodents cleaved-Prm2 ω log body mass 28 0.00 0.27 0.01 1(ns,ns) 0.79
log testes mass 0.00 −0.35 0.73
 Primates relative head length cleaved-Prm2 ω 11 0.02 0.07 0.00 1(ns,ns) 0.94
 Rodents relative head length cleaved-Prm2 ω 26 0.18 1.83 0.12 0.41(ns,ns) 0.08
Rodents relative head width cleaved- Prm2 ω 22 0.14 2.33 0.20 0.91(*,ns) 0.03
Rodents sperm head elongation cleaved- Prm2 ω 22 −8.07 −3.11 0.32 0.91(*,ns) 0.00
mature-Prm2
 Primates mature-Prm2 ω log body mass 12 0.02 1.19 0.27 0.86(ns,ns) 0.26
log testes mass 0.00 0.36 0.73
 Rodents mature-Prm2 ω log body mass 28 −0.03 −1.80 0.17 1(*,ns) 0.09
log testes mass −0.01 −0.30 0.77
 Primates Arginine content (mature-Prm2) log body mass 12 −1.32 −1.49 0.21 1(*,ns) 0.17
log testes mass 0.47 0.48 0.65
 Rodents Arginine content (mature-Prm2) log body mass 28 −0.02 −0.36 0.03 1(*,ns) 0.72
log testes mass −0.02 −0.52 0.61
 Primates relative head length mature-Prm2 ω 10 −0.02 −0.82 0.07 1(*,ns) 0.43
 Rodents relative head length mature-Prm2 ω 26 0.03 1.15 0.05 0(ns,ns) 0.26
 Rodents relative head width mature-Prm2 ω 22 0.03 0.94 0.04 0.96(*,ns) 0.36
 Rodents sperm head elongation mature-Prm2 ω 22 −1.08 −0.83 0.03 1(*,ns) 0.41
  1. The superscripts following the λ value indicate significance levels (ns: p >0.05; *: p <0.05) in likelihood ratio tests against models with λ = 0 (first superscript) and λ = 1 (second superscript). Abbreviations: n: number of species in analysis. Significant regression results are shown in boldface