A Combined Ultrasonic Backscatter Parameter for Bone Status Evaluation in Neonates

Table 3

The values of ultrasonic backscatter parameters among different gestational age groups.

Gestational; age group	PRE-1	PRE-2	PRE-3	TERM
	< 28 weeks	28 – 31^+6 weeks	32 – 36^+6 weeks	≥ 37 weeks
AIB (dB)
3.5 MHz	–51.64 (–54.36, –48.22)	–50.71 (–53.62, –46.78)	–44.54 (–48.42, –40.65)^ab	–41.94 (–44.95, –37.94)^abc
5.0 MHz	–55.78 (–58.61, –50.29)	–54.01 (–58.00, –49.56)	–50.84 (–54.22, –47.74)^ab	–47.28 (–50.49, –44.85)^abc
7.5 MHz	–51.29 (–53.66, –49.08)	–49.60 (–51.82, –47.85)	–48.28 (–50.27, –46.09)^ab	–46.74 (–48.62, –43.98)^abc
SCS (MHz)
3.5 MHz	–0.24 (–0.35, –0.10)	–0.28 (–0.40, –0.19)	–0.43 (–0.51, –0.31)^ab	–0.51 (–0.61, –0.42)^abc
5.0 MHz	–0.35 (–0.50, –0.14)	–0.41 (–0.53, –0.29)	–0.63 (–0.74, –0.49)^ab	–0.72 (–0.83, –0.59)^abc
7.5 MHz	–0.26 (–0.43, –0.09)	–0.43 (–0.65, –0.29)	–0.67 (–0.85, –0.50)^ab	–0.81 (–1.04, –0.63)^abc
CAS
3.5 MHz	–1.87 (–2.01, –1.71)	–1.76 (–1.93, –1.54)	–1.38 (–1.57, –1.20)^ab	–1.17 (–1.38, –1.03)^abc
5.0 MHz	–1.25 (–1.50, –1.10)	–1.16 (–1.36, –1.00)	–0.91 (–1.09, –0.71)^ab	–0.68 (–0.86, –0.56)^abc
7.5 MHz	–3.37 (–3.61, –3.18)	–3.12 (–3.34, –2.85)^a	–2.78 (–2.96, –2.53)^ab	–2.51 (–2.77, –2.31)^abc

^abcData are median (P₂₅, P₇₅). Significantly different from PRE-1 (P < 0.001). Significantly different from PRE-2 (P < 0.001). Significantly different from PRE-3 (P < 0.001).