Table 3.
Regression coefficients for the best model between log-transformed cecal length and body mass with clade and dietary category as additive cofactors (N = 155).
| Coefficient | Value | SE | p-value |
|---|---|---|---|
| Reference levels: Inopinaves & Carnivore – Vertebrates | |||
| Reference Intercept | −1.3243458 | 0.2437551 | 0 |
| Herbivory | 0.4588238 | 0.1714065 | 0.0083 |
| Carnivore – Aquatic Invertebrates | 0.1816623 | 0.1607742 | 0.2604 |
| Granivore/Frugivore | 0.2200885 | 0.1525698 | 0.1514 |
| Insectivore | 0.3865855 | 0.1339115 | 0.0045 |
| Nectarivore | −0.4127116 | 0.4367179 | 0.3463 |
| Omnivore | 0.3192183 | 0.1441751 | 0.0284 |
| Galloanserae | 1.3928131 | 0.2156552 | 0 |
| Aequorlitornithes | 0.4458934 | 0.1930361 | 0.0223 |
| Columbaves | 0.1564579 | 0.3556094 | 0.6606 |
| Gruiformes | 0.9224868 | 0.3213177 | 0.0047 |
| Palaeognathae | 0.900098 | 0.3386575 | 0.0088 |
| Strisores | 0.8523487 | 0.4736716 | 0.0741 |
| log10(body mass) | 0.347821 | 0.0744129 | 0 |
| Reference levels: Galloanserae & Herbivore | |||
| Reference Intercept | 0.5272911 | 0.2764784 | 0.0585 |
| Carnivore – Aquatic Invertebrates | −0.2771615 | 0.2095927 | 0.1882 |
| Carnivore – Vertebrates | −0.4588238 | 0.1714065 | 0.0083 |
| Granivore/Frugivore | −0.2387353 | 0.1439841 | 0.0995 |
| Insectivore | −0.0722383 | 0.1712176 | 0.6737 |
| Nectarivore | −0.8715354 | 0.4495318 | 0.0545 |
| Omnivore | −0.1396055 | 0.1611331 | 0.3877 |
| Aequorlitornithes | −0.9469197 | 0.2196839 | 0 |
| Columbaves | −1.2363552 | 0.3598717 | 0.0008 |
| Gruiformes | −0.4703264 | 0.33038 | 0.1568 |
| Inopinaves | −1.3928131 | 0.2156552 | 0 |
| Palaeognathae | −0.4927151 | 0.3230623 | 0.1295 |
| Strisores | −0.5404644 | 0.485988 | 0.268 |
| log10(body mass) | 0.347821 | 0.0744129 | 0 |
Default output of the regression analysis contrasts intercept values for clade and dietary categories with the reference intercept.