Scaling relationships for the cross-sectional bone geometry, curvature,and percent ash content in the emu femur and tibiotarsus during ontogeny
| . | a . | c . | 95%CI . | CI range . | R2 . |
|---|---|---|---|---|---|
| (A) Femur | |||||
| Cross-sectional geometry | |||||
| A (mm2) | 32 | 0.59 | 0.06 | 0.53, 0.65 | 0.87 |
| Ixx (mm4) | 120 | 1.38 | 0.07 | 1.31, 1.45 | 0.95 |
| Iyy (mm4) | 143 | 1.43 | 0.08 | 1.35, 1.51 | 0.90 |
| J (mm4) | 264 | 1.410 | 0.075 | 1.335, 1.485 | 0.93 |
| Curvature | |||||
| CCC | 0.77 | –0.20 | 0.08 | –0.28, –0.12 | 0.57 |
| CML | 0.82 | –0.12 | 0.06 | –0.18. –0.06 | 0.42 |
| Ash content (%) | 52 | 0.070 | 0.010 | 0.060, 0.080 | 0.88 |
| (B) Tibiotarsus | |||||
| Cross-sectional geometry | |||||
| A (mm2) | 26 | 0.63 | 0.05 | 0.58, 0.68 | 0.95 |
| Ixx (mm4) | 74 | 1.37 | 0.08 | 1.29, 1.45 | 0.93 |
| Iyy (mm4) | 76 | 1.45 | 0.07 | 1.38, 1.52 | 0.92 |
| J (mm4) | 150 | 1.41 | 0.07 | 1.34, 1.48 | 0.93 |
| Curvature | |||||
| CCC | 0.71 | –0.19 | 0.14 | –0.33, –0.05 | 0.19 |
| CML | 0.82 | –0.15 | 0.10 | –0.25, –0.05 | 0.32 |
| Ash content (%) | 54 | 0.055 | 0.009 | 0.046, 0.064 | 0.83 |
| . | a . | c . | 95%CI . | CI range . | R2 . |
|---|---|---|---|---|---|
| (A) Femur | |||||
| Cross-sectional geometry | |||||
| A (mm2) | 32 | 0.59 | 0.06 | 0.53, 0.65 | 0.87 |
| Ixx (mm4) | 120 | 1.38 | 0.07 | 1.31, 1.45 | 0.95 |
| Iyy (mm4) | 143 | 1.43 | 0.08 | 1.35, 1.51 | 0.90 |
| J (mm4) | 264 | 1.410 | 0.075 | 1.335, 1.485 | 0.93 |
| Curvature | |||||
| CCC | 0.77 | –0.20 | 0.08 | –0.28, –0.12 | 0.57 |
| CML | 0.82 | –0.12 | 0.06 | –0.18. –0.06 | 0.42 |
| Ash content (%) | 52 | 0.070 | 0.010 | 0.060, 0.080 | 0.88 |
| (B) Tibiotarsus | |||||
| Cross-sectional geometry | |||||
| A (mm2) | 26 | 0.63 | 0.05 | 0.58, 0.68 | 0.95 |
| Ixx (mm4) | 74 | 1.37 | 0.08 | 1.29, 1.45 | 0.93 |
| Iyy (mm4) | 76 | 1.45 | 0.07 | 1.38, 1.52 | 0.92 |
| J (mm4) | 150 | 1.41 | 0.07 | 1.34, 1.48 | 0.93 |
| Curvature | |||||
| CCC | 0.71 | –0.19 | 0.14 | –0.33, –0.05 | 0.19 |
| CML | 0.82 | –0.15 | 0.10 | –0.25, –0.05 | 0.32 |
| Ash content (%) | 54 | 0.055 | 0.009 | 0.046, 0.064 | 0.83 |
a and c are values for the y-intercept and exponent, respectively,in the exponential equation y=axc, where x is body mass (Mb) and y is the dependent variable
The 95% confidence interval (CI) and corresponding range represent the variation about the value for the scaling exponent (c)
Significant relationships are indicated in bold when the CI range does not overlap zero (bone curvature, percent ash content) or is significantly different from isometry (cross-sectional geometry; AαMb0.67; I,JαMb1.33)