Table 1.

Ages, sample sizes (N), means and standard deviations (s.d.) for lower molar (M₁) length and width for each population. Within-population (i.e. static) allometric slopes between molar width and length are reported with their standard errors (s.e.) and the coefficient of determination (R²). Static allometric relationships are estimated on log-transformed data using ordinary least-squares regression.

			molar length (mm)		molar width (mm)		static allometry
site names	age (Ma)	N	mean	s.d.	mean	s.d.	slope	s.e.	R2
Barranco León 5 (BL-5)	1.40	51	3.23	0.11	1.40	0.07	0.59	0.18	0.17
Fuente Nueva 3 (FN-3)	1.19	61	3.28	0.11	1.41	0.08	1.02	0.19	0.34
Gran Dolina (TD 4B)	1.01	12	3.43	0.14	1.43	0.08	0.53	0.40	0.15
Gran Dolina (TD 5b)	0.99	137	3.47	0.14	1.47	0.08	0.56	0.10	0.19
Gran Dolina (TD 5a)	0.96	104	3.49	0.14	1.49	0.08	0.65	0.11	0.25
Gran Dolina (TD 6-3)	0.86	101	3.43	0.17	1.49	0.09	0.53	0.11	0.19
Gran Dolina (TD 6-2)	0.83	10	3.59	0.18	1.53	0.10	0.20	0.43	0.03
Vallparadis (Vallp U10)	0.83	22	3.49	0.15	1.54	0.07	0.50	0.19	0.25
Gran Dolina (TD 6-1)	0.80	9	3.62	0.20	1.51	0.08	−0.15	0.36	0.02