Table 7. T-tests comparing foot proportions.

Two-sample t-tests (prosimians v. anthropoids)
	Prosimians		Anthropoids
Variable	mean	var	mean	var	t *	p
pp4/mt4a	0.947	0.040	0.516	0.003	27.481	<0.0001
mt1/mt2	0.977	0.010	0.600	0.003	31.942	<0.0001
mt3/mt4	1.021	0.001	0.948	0.001	14.831	<0.0001
mt4/mt5	1.074	0.002	1.056	0.001	2.447	0.0343

Results of two-sample t-tests comparing extant primate pedal proportions and t-tests comparing those of Notharctus tenebrosus (AMNH 143612/143640) and Darwinius to extant primate groups. For the fossil analyses, the smallest absolute t-value indicates which extant group the fossil is most similar to. Comparisons are considered significant at the Bonferroni adjusted alpha of 0.0125.

*t-statistic has been adjusted for comparison of distributions with unequal variance.

^aAbbreviations: Mt, metatarsal; proximal phalanx; ip, intermediate phalanx.

^bFor comparisons of Darwinius ratios involving mt4, both the reported and estimated values were analyzed (See Materials and Methods and Appendix S1). Therefore, the results of comparisons of the reported values are placed before the ‘/’ while those of the estimated values follow.