Table 4.
The Fixed Effect of Chronological Age and Concurrent Height, Weight, Body Mass Index or Mean Habitual Physical Activities on Peak Total Body BMC Attainment
Parameter | Male | Female | ||||
---|---|---|---|---|---|---|
Estimate | SE | P | Estimate | SE | P | |
Age and quadratic age | ||||||
a | −2.3346 | 0.1290 | <0.0001 | −1.5104 | 0.00869 | <0.0001 |
b | 0.4425 | 0.0164 | <0.0001 | 0.3569 | 0.0107 | <0.0001 |
c | −0.0090 | 0.0005 | <0.0001 | −0.0813 | 0.0003 | <0.0001 |
d | - | - | - | - | - | - |
e | - | - | - | - | - | - |
f | - | - | - | - | - | - |
Weight (kg) | ||||||
a | −0.7131 | 0.1712 | <0.0001 | −1.9338 | 0.1180 | <0.0001 |
b | 0.1802 | 0.02624 | <0.0001 | 0.4139 | 0.0184 | <0.0001 |
c | 0.0007 | 0.0009 | 0.4539 | −0.0103 | 0.0006 | <0.0001 |
d | −0.7408 | 0.1358 | <0.0001 | −0.4722 | 0.0998 | <0.0001 |
e | 0.1278 | 0.0207 | <0.0001 | 0.1050 | 0.0153 | <0.0001 |
f | 0.0040 | 0.0008 | <0.0001 | −0.0038 | 0.0006 | <0.0001 |
Height (m) | ||||||
a | −0.9877 | 0.1806 | <0.0001 | −2.2859 | 0.1455 | <0.0001 |
b | 0.2191 | 0.0771 | <0.0001 | 0.4635 | 0.0215 | <0.0001 |
c | −0.0007 | 0.0010 | 0.5176 | −0.0119 | 0.0007 | <0.0001 |
d | −0.3191 | 0.1687 | 0.0590 | −0.6987 | 0.1326 | <0.0001 |
e | 0.0583 | 0.0259 | 0.0246 | 0.1221 | 0.0878 | <0.0001 |
f | −0.0012 | 0.0010 | 0.2129 | −0.0040 | 0.0006 | <0.0001 |
BMI (kg/m2) | ||||||
a | −0.9022 | 0.1904 | <0.0001 | −2.1505 | 0.1325 | <0.0001 |
b | 0.2072 | 0.0294 | <0.0001 | 0.4471 | 0.0206 | <0.0001 |
c | 0.0001 | 0.0010 | 0.9095 | −0.0113 | 0.0007 | <0.0001 |
d | −0.4190 | 0.1421 | 0.0041 | −0.3289 | 0.1114 | 0.0033 |
e | 0.0704 | 0.02158 | 0.0011 | 0.0781 | 0.0167 | <0.0001 |
f | −0.0021 | 0.0008 | 0.0064 | −0.0029 | 0.0006 | <0.0001 |
Habitual physical activity | ||||||
Leisure activity index | ||||||
a | −3.2218 | 0.6133 | <0.0001 | −2.0008 | 0.5431 | 0.0003 |
b | 0.5625 | 0.0806 | <0.0001 | 0.4210 | 0.0658 | <0.0001 |
c | −0.0122 | 0.0023 | <0.0001 | −0.0104 | 0.0019 | <0.0001 |
d | 0.2681 | 0.2415 | 0.2686 | 0.2333 | 0.2092 | 0.2664 |
e | −0.0356 | 0.0316 | 0.2601 | −0.0285 | 0.0252 | 0.2595 |
f | 0.0009 | 0.0009 | 0.3065 | 0.0010 | 0.0007 | 0.1777 |
Sport activity index | ||||||
a | −1.7245 | 0.5196 | 0.0011 | −0.8739 | 0.3565 | 0.0153 |
b | 0.3740 | 0.0697 | <0.0001 | 0.2970 | 0.0436 | <0.0001 |
c | −0.0084 | 0.0020 | <0.0001 | −0.0073 | 0.0012 | <0.0001 |
d | −0.3017 | 0.1862 | 0.1071 | −0.2148 | 0.1417 | 0.1314 |
e | 0.03590 | 0.0250 | 0.1512 | 0.0202 | 0.0174 | 0.2453 |
f | −0.0005 | 0.0007 | 0.4621 | −0.0003 | 0.0005 | 0.6201 |
Work activity index | ||||||
a | −3.0421 | 0.6300 | <0.0001 | −1.6649 | 0.5184 | 0.0016 |
b | 0.5161 | 0.0832 | <0.0001 | 0.3627 | 0.0619 | <0.0001 |
c | −0.0107 | 0.0023 | <0.0001 | −0.0079 | 0.0017 | <0.0001 |
d | 0.1772 | 0.2207 | 0.4234 | 0.0972 | 0.1889 | 0.6077 |
e | −0.0156 | 0.0292 | 0.5939 | −0.0057 | 0.0226 | 0.8007 |
f | 0.0003 | 0.0008 | 0.7095 | −0.0000 | 0.0006 | 0.9707 |
Total activity index | ||||||
a | −2.4884 | 0.9411 | 0.0093 | −1.0150 | 0.7221 | 0.1618 |
b | 0.4636 | 0.1249 | 0.0002 | 0.3091 | 0.0085 | 0.0003 |
c | −0.0107 | 0.0036 | 0.0027 | −0.0077 | 0.0024 | 0.0012 |
d | −0.0098 | 0.1167 | 0.9334 | −0.0497 | 0.0935 | 0.5960 |
e | 0.0013 | 0.0155 | 0.9330 | 0.0050 | 0.0110 | 0.6507 |
f | 0.0001 | 0.0004 | 0.8192 | −0.0000 | 0.0003 | 0.9129 |
The model equations were as follows: Values of repeated measurements of total body bone mineral content (TBMC) = a (intercept) + b (parameter of age at the time of TBMC) + c (quadratic parameter of age) + d (parameter of covariable, e.g., concurrent BMI) + e (parameter of the age and a covariable) + e (parameter of the quadratic age and a covariable).