Table 3.

The correlation coefficients (R²) between the ultrasound attenuation in four frequency bands and the trabecular structural properties of the samples. Table 3a is for the attenuation measured in PD orientation. Table 3b is for the attenuation measured in the AP orientation. Table 3c is for the attenuation measured in the ML orientation.

	Tr.N	BV/TV	Tr.Th	Tr.Sp
300 kHz to 700 kHz	0.78^*	0.62^*	0.38^*	0.85^*
700 kHz to 1.1 MHz	0.81^*	0.68^*	0.45^*	0.84^*
1.1 MHz to 1.5 MHz	0.78^*	0.70^*	0.48^*	0.78^*
1.5 MHz to 1.9 MHz	0.81^*	0.73^*	0.50^*	0.83^*
(a)

	Tr.N	BV/TV	Tr.Th	Tr.Sp
300 kHz to 700 kHz	0.71^*	0.68^*	0.48^*	0.80^*
700 kHz to 1.1 MHz	0.63^*	0.75^*	0.60^*	0.73^*
1.1 MHz to 1.5 MHz	0.58^*	0.80^*	0.71^*	0.66^*
1.5 MHz to 1.9 MHz	0.54^*	0.61^*	0.43^*	0.63^*
(b)

	Tr.N	BV/TV	Tr.Th	Tr.Sp
300 kHz to 700 kHz	0.27 (p=0.01)	0.22 (p=0.012)	0.15 (p=0.033)	0.33 (p=0.002)
700 kHz to 1.1 MHz	0.20 (p=0.025)	0.17 (p=0.026)	0.14 (p=0.045)	0.25 (p=0.007)
1.1 MHz to 1.5 MHz	0.16 (p=0.04)	0.15 (p=0.047)	0.13 (p=0.072)	0.21 (p= 0.015)
1.5 MHz to 1.9 MHz	0.16 (p=0.051)	0.15 (p=0.062)	0.09 (p=0.15)	0.21 (p=0.023)
(c)

indicates the p value of the correlation coefficient was less than 0.001.