Normal values of shear wave velocity in liver tissue of healthy children measured using the latest acoustic radiation force impulse technology

Table 3 Effect of age on shear wave velocity measured in different hepatic lobes and at different depths

Liver lobe/depth	Age group (yr)				P value	Compar-ison	P value
	Group 1 (n = 28)	Group 2 (n = 68)	Group 3 (n = 58)	Group 4 (n = 48)
Left/1.5 cm					0.038
Mean ± SD	2.41 ± 0.40	2.53 ± 0.40	2.70 ± 0.46	2.63 ± 0.53		G1-G3	0.038
95%CI	2.25-2.56	2.43-2.63	2.56-2.85	2.34-2.92
Left/2.0 cm					0.002
Mean ± SD	1.92 ± 0.25	2.07 ± 0.39	2.08 ± 0.29	2.27 ± 0.55		G1-G4	0.002
95%CI	1.82-2.02	1.97-2.16	2.01-2.16	2.11-2.43		G2-G4	0.042
Left/2.5 cm					0.116
Mean ± SD	1.69 ± 0.23	1.75 ± 0.28	1.76 ± 0.26	1.84 ± 0.33
95%CI	1.60-1.78	1.69-1.82	1.69-1.83	1.75-1.94
Left/3.0 cm					0.091
Mean ± SD	1.56 ± 0.15	1.65 ± 0.21	1.68 ± 0.25	1.69 ± 0.24
95%CI	1.49-1.62	1.58-1.72	1.60-1.75	1.62-1.77
Right/1.5 cm					0.160
Mean ± SD	2.37 ± 0.29	2.53 ± 0.41	2.61 ± 0.44	2.57 ± 0.38
95%CI	2.25-2.50	2.41-2.65	2.46-2.75	2.41-2.72
Right/2.0 cm					0.131
Mean ± SD	1.98 ± 0.22	2.09 ± 0.36	2.12 ± 0.30	2.18 ± 0.43
95%CI	1.90-2.07	2.00-2.18	2.04-2.20	2.05-2.30
Right/2.5 cm					0.419
Mean ± SD	1.69 ± 0.23	1.75 ± 0.29	1.73 ± 0.23	1.79 ± 0.35
95%CI	1.60-1.77	1.68-1.82	1.67-1.79	1.69-1.90
Right/3.0 cm					0.061
Mean ± SD	1.53 ± 0.24	1.65 ± 0.32	1.59 ± 0.18	1.70 ± 0.22
95%CI	1.42-1.65	1.52-1.78	1.53-1.66	1.63-1.76

G1-G4: Groups 1-4. Significant differences are highlighted in boldface.