Table 3.

Analysis of the significance of the various quantitative X-ray outputs as predictors of areal bone mineral density for the multivariate model selected using forward–backward stepwise model selection

	Estimate	SE	t-value	P value
(Intercept)	7.39	1.72	4.30	<0.001
Gender	0.0481	0.02	2.40	0.0175
Bone thickness	2.63	0.913	2.88	0.0046
Thickness	−0.566	0.132	−4.28	<0.001
Hard tissue fraction	−46.1	17.5	−2.63	0.0095
Bone thickness2	−0.329	0.111	−2.96	0.0036
Intensity2	0.00	0.00	−5.57	<0.001
Thickness2	0.011	0.0024	4.61	<0.001
Hard tissue fraction2	117.5	40.9	2.87	0.0047