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(A) Robustness (Tt.Ar/Le) and (B) marrow area (Ma.Ar) of the second metacarpal diaphysis change over time differently for boys and girls in the most robust quartile compared with those in the most slender quartile. Quartiles were assessed using data at 8 yr of age. Error bars are SD. *p < 0.008 for boys and **p < 0.008 for girls (t-tests corrected for multiple comparisons).
