Table 2.
Female | Male | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
2 mo. (n = 11) |
4 mo. (n = 10) |
7 mo. (n = 10) |
12 mo. (n = 10) |
20 mo. (n = 8) |
2 mo. (n = 11) |
4 mo. (n = 10) |
7 mo. (n = 10) |
12 mo. (n = 10) |
20 mo. (n = 10) |
||
Body MassA,S,A-S
(g) |
19.4 ± 0.7 |
21.7a
± 0.7 |
26.0a,b
± 1.4 |
27.1a,b
± 1.5 |
26.4a,b
± 2.9 |
22.8*
± 1.1 |
26.3*,a
± 1.1 |
31.9*,a,b
± 4.5 |
30.5*,a,b
± 2.7 |
26.0a,c,d
± 5.2 |
|
Femur | LengthA
(mm) |
13.8 ± 0.4 |
15.3a
± 0.3 |
15.9a,b
± 0.2 |
16.2a,b
± 0.4 |
16.5a,b,c,d
± 0.3 |
13.9 ± 0.9 |
15.3a
± 0.3 |
16.0a,b
± 0.3 |
15.9a,b
± 0.8 |
16.4a,b,c,d
± 0.3 |
Bone AreaA,A-S
(mm2) |
0.718 ± 0.019 |
0.891a
± 0.065 |
0.975a,b
± 0.052 |
1.057a,b,c
± 0.091 |
1.079a,b,c
± 0.026 |
0.786*
± 0.056 |
0.953*,a
± 0.039 |
1.042a,b
± 0.126 |
1.006a,b
± 0.086 |
1.005a,b
± 0.105 |
|
Mom. InertiaA,S,A-S
(mm4) |
0.075 ± 0.004 |
0.105a
± 0.017 |
0.122a,b
± 0.014 |
0.153a,b,c
± 0.027 |
0.201a,b,c,d
± 0.013 |
0.093*
± 0.010 |
0.107 ± 0.010 |
0.124a,b
± 0.035 |
0.134a,b
± 0.023 |
0.149*,a,b,c,d
± 0.024 |
|
Cortical ThicknessA,S
(mm) |
0.231 ± 0.015 |
0.271a
± 0.016 |
0.285a
± 0.013 |
0.301a,b
± 0.025 |
0.275a,d
± 0.016 |
0.257*
± 0.033 |
0.294*,a
± 0.011 |
0.335*,a,b
± 0.037 |
0.318a,b
± 0.031 |
0.314*,a,b
± 0.034 |
|
Radius | LengthA,S
(mm) |
10.4 ± 0.3 |
11.1a
± 0.1 |
11.1a
± 0.2 |
11.0a
± 0.2 |
11.1a
± 0.6 |
10.7 ± 0.4 |
11.2a
± 0.2 |
11.7*,a,b
± 0.4 |
11.6*,a,b
± 0.3 |
11.5*,a
± 0.4 |
Bone AreaA,S,A-S
(mm2) |
0.207 ± 0.009 |
0.232a
± 0.012 |
0.256a,b
± 0.012 |
0.268a,b,c
± 0.015 |
0.271a,b,c
± 0.007 |
0.233*
± 0.016 |
0.256*,a
± 0.010 |
0.265a
± 0.019 |
0.266a
± 0.015 |
0.266a
± 0.013 |
|
Mom. InertiaA,S,A-S
(mm4) |
0.0054 ± 0.0005 |
0.0063a
± 0.0007 |
0.0073a,b
± 0.0009 |
0.0079a,b
± 0.0011 |
0.0094a,b,c,d
± 0.0013 |
0.0076*
± 0.0012 |
0.0076*
± 0.0008 |
0.0085*
± 0.0012 |
0.0085 ± 0.0010 |
0.0085 ± 0.0011 |
|
Cortical ThicknessA,A-S
(mm) |
0.147 ± 0.005 |
0.169a
± 0.006 |
0.191a,b
± 0.008 |
0.197a,b,c
± 0.007 |
0.189a,b,d
± 0.007 |
0.153*
± 0.007 |
0.180*,a
± 0.006 |
0.183a
± 0.008 |
0.183*,a
± 0.007 |
0.179*,a
± 0.009 |
Area, moment of inertia and thickness were determined at the mid-diaphysis using microCT
Significant effect of age;
Significant effect of sex;
Significant age-sex interaction; ANOVA, p < 0.05
Male different from female at same age, p < 0.05 post hoc test
different from 2 mo;
different from 4 mo;
different from 7 mo;
different from 12 mo;
p < 0.05 post hoc test