. Author manuscript; available in PMC: 2021 Jun 21.

Published in final edited form as: J Acoust Soc Am. 2000 Jun;107(6):3474–3479. doi: 10.1121/1.429417

Table I.

Experimental measurements for the 43 human calcaneus samples.

	Anteroposterior (AP) Mean ± SD (SE)	Mediolateral (ML) Mean ± SD (SE)	Difference AP - ML values Mean ± SD (SE)
Apparent Attenuation Coefficient at 500 kHz (dB/cm)	7.59 ± 4.51 (0.69) #	4.34 ± 2.83 (0.43) #	3.25 ± 2.59 (0.40) *
Attenuation Slope or nBUA (dB/cmMHz)	11.80 ± 7.44 (1.13)	10.01 ± 5.56 (0.85)	1.79 ± 6.29 (0.96) $
Backscatter Coefficient at 500 kHz (cm⁻¹Sr⁻¹)	0.018 ± 0.016 (0.002) #	0.036 ± 0.042 (0.006) #	−0.019 ± 0.039 (0.006) *
Exponent (n) from power law fit to backscatter coefficient vs. frequency, BC = Afⁿ	2.7 ± 1.4 (0.2)	3.2 ± 1.4 (0.2)	-

The asterisk (*) and dollar ($) symbols denote that the null hypothesis that the mean difference equals zero can be rejected at the 95% and 90% confidence levels respectively. The pound sign (#) denotes that the null hypothesis that the means from the AP and ML distributions are equal can be rejected at the 95% confidence level.