Integration, heterochrony, and adaptation in pedal digits of syndactylous marsupials

Table 3 Raw data regression results

	Regression				Correlation comparisons between II/III and others
	Intercept	Error	Slope	Error	r	dz	p
Metatarsals
II and III	0.333	0.924	0.907	0.028	0.986
II and IV	1.167	1.451	0.766	0.038	0.965	1.790	0.074
II and V	4.103	2.421	0.746	0.069	0.892	3.931	0.000
IV and V	2.224	1.422	1.029	0.040	0.978	0.853	0.394
Pr. Phalanges
II and III	-0.308	0.210	1.014	0.016	0.996
II and IV	-0.886	1.777	0.732	0.096	0.812	7.395	0.000
II and V	-1.264	1.722	0.968	0.120	0.828	7.128	0.000
IV and V	2.659	1.892	1.077	0.132	0.831	7.170	0.000
Int. Phalanges
II and III	-0.552	0.352	1.087	0.043	0.977
II and IV	-1.314	1.843	0.729	0.160	0.641	5.57	0.000
II and V	-2.208	1.390	1.073	0.155	0.784	4.41	0.000
IV and V	2.866	1.212	0.948	0.788	0.788	4.340	0.000

Regression results of raw length regressions between corresponding digit elements. Note that elements of digits II and III are close to identical in length in all species as shown by intercepts near 0 and slopes close to 1 with very little error. This is also reflected in tight correlations between digits II and III, which are nearly all significantly stronger than any other between-digit correlations (the relatively weaker results in metatarsals comparisons are caused by a single high-leverage outlier, Diprotodon optatum). r, Pearson correlation coefficient; dz, difference of z-score transformed correlations; p, significance.