Table 8.

Intra-specific scaling properties of articular facet curvature radii relative to cubed centroid size derived from RMA regression models

Facet	Facet type	Scaling exponent (95% CI)	R2	Reject isometric scaling with centroid size?
Hylobates moloch
Trochlea	Convex	0.338 (0.205, 0.470)	0.808	No
Head	Convex	0.437 (0.281, 0.593)	0.841	No
Sustentaculum	Convex	0.489 (0.140, 0.838)	0.361	No
Calcaneal	Concave	0.511 (0.064, 0.958)	0.043	No
Symphalangus syndactylus
Trochlea	Convex	0.482 (0.360, 0.603)	0.904	Yes (positive allometry)
Head	Convex	0.328 (0.160, 0.496)	0.605	No
Sustentaculum	Convex	0.803 (0.190, 1.416)	0.125	No
Calcaneal	Concave	0.748 (0.363, 1.133)	0.601	Yes (positive allometry)
Pongo pygmaeus
Trochlea	Convex	0.546 (0.408, 0.684)	0.855	Yes (positive allometry)
Head	Convex	0.294 (0.202, 0.387)	0.775	No
Sustentaculum	Convex	0.766 (0.418, 1.114)	0.531	Yes (positive allometry)
Calcaneal	Concave	0.545 (0.275, 0.815)	0.442	No
Gorilla gorilla
Trochlea	Convex	0.430 (0.364, 0.495)	0.839	Yes (positive allometry)
Head	Convex	0.412 (0.335, 0.489)	0.759	Yes (positive allometry)
Sustentaculum	Convex	0.527 (0.388, 0.665)	0.523	Yes (positive allometry)
Calcaneal	Concave	0.540 (0.426, 0.654)	0.691	Yes (positive allometry)
Pan troglodytes
Trochlea	Convex	0.474 (0.373, 0.575)	0.683	Yes (positive allometry)
Head	Convex	0.533 (0.423, 0.642)	0.706	Yes (positive allometry)
Sustentaculum	Convex	1.156 (0.499, 1.813)	0.267	Yes (positive allometry)
Calcaneal	Concave	0.684 (0.517, 0.852)	0.587	Yes (positive allometry)
Homo sapiens
Trochlea	Convex	0.382 (0.331, 0.432)	0.756	No
Head	Convex	0.429 (0.378, 0.480)	0.803	Yes (positive allometry)
Sustentaculum	Convex	0.622 (0.500, 0.744)	0.467	Yes (positive allometry)
Calcaneal	Concave	0.376 (0.293, 0.458)	0.332	No

CI, confidence interval.