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Table 2 Multiple regressions of brightness in different body parts in 2010 and 2011

From: Brightness of melanin-based plumage coloration is a cue to oxidative stress in Himalayan Black Bulbuls (Hypsipetes leucocephalus nigerrimus)

Parts Terms 2010 2011
t ratio p t ratio p
Back Intercept 7.25 <.0001 29.49 <.0001
Sex(F) 0.25 0.808 0.83 0.413
Log(H/L ratio)a −0.05 0.964 −1.14 0.262
Sex(F) × Log(H/L ratio) −1.46 0.166 −1.49 0.144
Belly Intercept 6.09 <.0001 24.15 <.0001
Sex(F) −1.37 0.194 1.53 0.134
Log(H/L ratio) 0.78 0.447 −1.35 0.183
Sex(F) × Log(H/L ratio) −0.85 0.409 0.35 0.728
Breast Intercept 9.00 <.0001 24.53 <.0001
Sex(F) 0.65 0.525 0.93 0.358
Log(H/L ratio) 0.19 0.853 −2.43 0.019*
Sex(F) × Log(H/L ratio) −1.44 0.172 −0.46 0.645
Forehead Intercept 3.85 0.002 17.16 <.0001
Sex(F) 1.52 0.150 −0.02 0.984
Log(H/L ratio) −0.49 0.635 −0.39 0.696
Sex(F) × Log(H/L ratio) −0.43 0.675 0.18 0.858
Nape Intercept 7.03 <.0001 30.95 <.0001
Sex(F) −0.75 0.465 0.01 0.995
Log(H/L ratio) 0.70 0.497 −0.62 0.539
Sex(F) × Log(H/L ratio) 0.18 0.858 −1.2 0.238
Scapulars Intercept 8.07 <.0001 40.47 <.0001
Sex(F) −2.22 0.043* 0.03 0.976
Log(H/L ratio) −1.01 0.329 −2.37 0.022*
Sex(F) × Log(H/L ratio) −0.76 0.461 −0.93 0.358
Remige Intercept 5.70 <.0001 49.39 <.0001
Sex(F) −2.41 0.032* 0.59 0.555
Log(H/L ratio) −0.67 0.515 −0.28 0.782
Sex(F) × Log(H/L ratio) −1.60 0.133 −0.78 0.440
Tail Intercept 6.23 <.0001 27.93 <.0001
Sex(F) 0.31 0.759 2.1 0.042*
Log (H/L ratio) 0.13 0.899 0.34 0.739
Sex(F) × Log(H/L ratio) 1.01 0.330 −0.36 0.724
  1. p < 0.05
  2. aHeterocyte/lymphocyte ratio log transformed to normalize the distribution
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