. Author manuscript; available in PMC: 2019 Sep 1.

Published in final edited form as: J Ultrasound Med. 2018 Feb 20;37(9):2157–2169. doi: 10.1002/jum.14566

Table 1.

Shape and Rate parameters for single gamma distribution and a mixture of two gamma distributions fitted to the backscattered echo intensity of the rectus femoris muscle from healthy volunteers and children with CP, with the muscle relaxed and during MVIC.

		Healthy Volunteers (N=14)		Patients with CP (N=22)
		Relaxed	MVIC	Relaxed	MVIC
Single gamma	α	1.24±0.13	1.19±0.10	1.49±0.22	1.44±0.19
Single gamma	β	33.0±8.6	41.1±13.8	25.1±8.1	29.9±11.4
Mixture of gamma	α₁	1.21±0.09	1.17±0.10	1.39±0.22	1.32±0.17
	α₂	2.00±0.15	2.03±0.17	2.25±0.21	2.31±0.23
	β₁	13.6±3.6	17.1±5.7	11.3±2.6	12.6±2.5
	β₂	77.4±16.9	108.8±34.1	53.5±18.4	69.0±23.1
	p	0.19±0.04	0.22±0.08	0.23±0.11	0.24±0.12