Table 2.
Partial correlations relating tissue level composition and mechanical properties in skeletally mature young (4 or 5 months) and old (19 months) age groups
| Age (months) |
Carbonate/ Phosphate |
MMR | Cross- linking |
Group Effect |
p | Adjusted R2 |
|
|---|---|---|---|---|---|---|---|
| Modulus |
4 or 5 19 |
N.S. N.S. |
0.538 N.S. |
−0.650 N.S. |
<0.05 N.S. |
0.426 | |
| Hardness |
4 or 5 19 |
N.S. N.S. |
N.S. −0.883 |
−0.598 N.S. |
<0.05 <0.05 |
0.324 0.757 |
|
| Plasticity Index |
4 or 5 19 |
0.768 N.S. |
N.S. 0.914 |
N.S. N.S. |
<0.05 <0.05 |
0.632 0.818 |
|
| Creep Displaceme nt (ln) |
4 or 5 19 |
N.S. N.S. |
N.S. N.S. |
0.606 N.S. |
E=0.429Δ | <0.05 N.S. |
0.328 |
| Creep modulus parallel (ln) |
4 or 5 19 |
N.S. N.S. |
0.653 N.S. |
−0.609 N.S. |
<0.05 N.S. |
0.462 | |
| Creep viscosity parallel(ln) |
4 or 5 19 |
N.S. N.S. |
0.656 N.S. |
−0.590 N.S. |
<0.05 N.S. |
0.453 | |
| Creep viscosity series (ln) |
4 or 5 19 |
N.S. N.S. |
N.S. −0.531Δ |
−0.613 N.S. |
E=− 0.439Δ | <0.05 <0.1 |
0.339 0.211 |
Δ
indicates significance of partial correlation 0.05 < p < 0.10. All other partial correlations significant at p < 0.05.
N.S. indicates no significant model existed with covariates.
(ln)
indicates that the natural log of dependent variable was used in the regression (to satisfy normality assumption)
E = Effect of exercise
Crystallinity was excluded from the table because it did not significantly contribute to any model.