. Author manuscript; available in PMC: 2007 Jan 1.

Published in final edited form as: J Bone Miner Res. 2005 Oct 3;21(1):124–131. doi: 10.1359/JBMR.050916

Table 1.

3-D-pQCT Parameters in an Age-Stratified, Random Sample of Rochester, MN, Women (W) and Men (M)

	Women				Men				p-values
		Change between 20 and 90 years				Change between 20 and 90 years
	Mean ± SD (20–29 years) (N = 17)	Absolute	Percentage	Age-Corr.^*	Mean ± SD (20–29 years) (N = 19)	Absolute	Percentage	Age-Corr.^*	M/W difference in young adults	M/W age difference^†
Trabecular parameters
BV/TV	0.141 ± 0.028	−0.039	−27^¶	−0.27	0.178 ± 0.031	−0.047	−26^¶	−0.39	0.001	0.524
TbN (1/mm)	2.64 ± 0.17	−0.35	−13^¶	−0.29	2.60 ± 0.25	0.17	7^‡	0.02	0.577	<0.001
TbTh (mm)	0.053 ± 0.009	−0.010	−18^¶	−0.21	0.068 ± 0.008	−0.018	−24^‡^¶	−0.43	<0.001	0.010
TbSp (mm)	0.327 ± 0.031	0.076	24^¶	0.31	0.320 ± 0.041	−0.007	−2^‡	0.11	0.531	<0.001
Cortical parameters
BA (mm²)	235.3 ± 29.5	27.4	11^§	0.16	355.9 ± 62.7	40.2	11^§	0.16	<0.001	0.458
BA (mm²/ht, m)	143.9 ± 15.1	25.6	18^¶	0.25	196.9 ± 29.9	37.8	19^¶	0.28	<0.001	0.201
EnA (mm²)	176.5 ± 27.3	46.4	27^¶	0.26	277.8 ± 62.0	52.8	19^¶	0.21	<0.001	0.713
EnA (mm²/ht, m)	108.0 ± 15.1	35.5	34^¶	0.33	153.6 ± 30.7	42.1	28^¶	0.30	<0.001	0.502
CTh (mm)	0.825 ± 0.136	−0.437	−52^‡^¶	−0.58	0.852 ± 0.176	−0.320	−38^‡^¶	−0.40	0.603	0.001
Cort vBMD (mg/cm²)	893.0 ± 45.2	−192.7	−22^‡^¶	−0.64	850.3 ± 38.0	−133.7	−16^‡^¶	−0.48	0.005	<0.001

Where there was a significant relationship between height (Ht) and a given variable in young adults, both the unadjusted and adjusted values for all variables are given.

Pearson correlation coefficient.

^†

Comparisons of slopes.

^‡

Indicates that regression model is nonlinear.

^§

p < 0.01;

^¶

p < 0.001.

BV/TV, bone volume/tissue volume; TbN, trabecular number; TbTh, trabecular thickness; TbSp, trabecular separation; BA, bone area; EnA, endocortical area; CTh, cortical thickness; Cort vBMD, cortical volumetric BMD.