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Table 4 Differences in size and mass between right and left bones of forelimbs in 23 walruses (Odobenus rosmarus).

From: Feeding behaviour of free-ranging walruses with notes on apparent dextrality of flipper use

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
  1. 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).