Table 4:

Parameters of the four-fiber family constitutive model describing the 25^th percentile response of human SFAs in 7 age groups. A total of 19 different loading protocols were used to determine the constitutive parameters for this model. The coefficient of determination R² ≥ 0.99 for all age groups.

Age group (years)	Cgr, kPa	${\mathit{C}}_{\mathbf{1}}^{\mathbf{1}},\mathit{k}\mathit{P}\mathit{a}$	${\mathit{C}}_{\mathbf{2}}^{\mathbf{1}}$	${\mathit{C}}_{\mathbf{1}}^{\mathbf{2}},\mathit{k}\mathit{P}\mathit{a}$	${\mathit{C}}_{\mathbf{2}}^{\mathbf{2}}$	${\mathit{C}}_{\mathbf{3}}^{\mathbf{2}}={\mathit{C}}_{\mathbf{4}}^{\mathbf{2}},\mathit{k}\mathit{P}\mathit{a}$	${\mathit{C}}_{\mathbf{3}}^{\mathbf{2}}={\mathit{C}}_{\mathbf{4}}^{\mathbf{2}}$	γ°
16±2 (12–20)	11.34	21.84	0.40	0.14	10.83	9.36	2.69	66.62
26±4 (21–30)	14.37	13.06	0.76	1.68	7.70	2.86	6.43	66.31
37±2 (31–40)	0.09	28.77	0.66	1.40	15.90	32.41	0.93	60.80
46±3 (41–50)	19.56	15.41	3.74	25.81	19.31	1.89	22.77	51.82
57±3 (51–60)	29.85	0.55	22.87	13.38	41.68	1.05	54.94	46.84
64±3 (61–70)	0.06	39.48	10.11	8.50	68.40	52.19	20.34	53.57
76±7 (71–92)	24.46	50.80	31.42	44.55	60.75	8.59	111.64	40.67