Table 2:

Parameters for the four-fiber family constitutive model describing the median response of human SFAs in 7 decadal 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)	2.59	21.52	0.12	8.37	1.59	6.30	1.31	55.53
26±4 (21–30)	5.25	12.63	0.45	3.47	3.84	3.46	2.43	57.54
37±2 (31–40)	4.16	14.50	0.66	9.05	5.09	5.41	3.40	55.88
46±3 (41–50)	5.36	13.78	1.39	17.02	7.40	4.19	7.07	53.88
57±3 (51–60)	4.50	20.33	2.83	13.54	10.01	5.31	10.88	50.67
64±3 (61–70)	4.79	18.60	5.89	11.23	12.68	4.44	18.39	47.33
76±7 (71–92)	0.00	28.38	15.16	15.18	18.43	10.42	30.65	45.78