Table 1. Component loadings and other results of the group-mean PCA based on size-adjusted crown diameters.

	Maxilla		Mandible
Variables	PC1	PC2	PC1	PC2
P1 MD	-0.58	-0.05	0.97	0.18
P1 BL	-0.94	0.07	0.89	-0.38
P2 MD	-0.76	-0.46
P2 BL	-0.74	0.61
M1 MD	0.76	0.53	-0.93	-0.29
M1 BL	-0.22	-0.63	0.70	-0.44
M2 MD	0.67	-0.65	-0.64	-0.22
M2 BL	0.31	0.43	0.75	-0.16
M3 MD			-0.80	0.59
M3 BL			-0.34	0.19
Proportion of the variance (%)	49	26	79	12
Cumulative proportion (%)	49	75	79	91
Pearson’s r with the ‘crown size factor’ a	-0.05	-0.06	-0.07	0.26

^aCorrelation coefficient based on the sample of the H. sapiens individuals.