Occipital condyle width (OCW) is a highly accurate predictor of body mass in therian mammals

Table 7 Body mass regression equations using condylobasal length (CBL) and head-body length (HBL)

Analysis	N	Equation	df	r²_adj	%PE	CF	%PE_cf	%SEE
Condylobasal length (CBL)
CBL	404	ln(body mass) = 14.2241 × ln(CBL)^1/2 − 22.4349	402	0.9722	39.96	1.182	35.93	60.32
CBL no primates	360	ln(body mass) = 14.1665 × ln(CBL)^1/2 − 22.3646	358	0.9753	38.80	1.211	35.06	58.65
HBL
HBL	404	ln(body mass) = 2.9749 × ln(HBL) − 10.3386	402	0.9775	35.79	1.195	34.38	52.91
OCW versus CBL and HBL
OCW versus CBL	404	ln(body mass) = 1.04366 × ln(OCW) − 1.38825	402	0.9654	12.04	1.012	12.01	16.55
OCW versus HBL	404	ln(body mass) = 2.53378 × ln(OCW)^2/3 − 0.82550	402	0.9634	13.92	1.015	13.77	19.70
OCW + CBL + HBL
OCW + CBL + HBL	404	ln(body mass) = 3.8162 × ln(OCW)^2/3 + 1.1223 × ln(HBL) + 1.9521 × ln(CBL)^1/2 − 11.1212	402	0.9889	24.41	1.098	23.34	34.95

Abbreviations as for Table 3 and “Methods”. Condylobasal length approximately equivalent to skull length in this analysis

ISSN: 1741-7007