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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: J Clin Densitom. 2014 Oct 18;19(2):180–191. doi: 10.1016/j.jocd.2014.08.001

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).

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