Table 4.

Differences in size and mass between right and left bones of forelimbs in 23 walruses (Odobenus rosmarus).

All specimens (n = 23)	Average of differences, ∑ (R-L)/n (mm or g)	Average of differences in % of bone length or mass ∑ ((R-L)/L*100)/n	% R > L;R = L; R < L	Significance of difference (Wilcoxon signed rank test)
Scapula length (n = 22)	2.63	1.08	64% 18% 18%	0.005*
Scapula height (n = 22)	0.18	-0.02	41% 27% 32%	0.68
Humerus length (n = 21)	1.00	0.64	52% 43% 5%	0.004*
Radius length (n = 23)	0.39	0.29	39% 39% 22%	0.29
Ulna length (n = 21)	1.38	0.62	62% 29% 9%	0.02*
Scapula mass (n = 19)	2.05	0.66	37% 10% 53%	0.67
Humerus mass (n = 17)	5.06	1.08	71% 5% 24%	0.09
Radius mass (n = 20)	-0.10	1.14	50% 30% 20%	0.44
Ulna mass (n = 21)	1.76	0.45	38% 33% 29%	0.55

R refers to right bones. L refers to left bones. Size: mm. Mass: g. The numbers in brackets are number of examined specimens. P-values marked with * are statistically significant (P ≤ 0.05).