Table 7:

Parameters of the four-fiber family constitutive model describing the 75^th percentile response of human PAs in 7 age groups. A total of 19 different loading protocols were used to determine the constitutive parameters in 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)	0.03	19.78	0.19	0.10	8.78	17.85	0.83	66.92
26±4 (21–30)	0.01	10.98	0.08	0.02	9.36	6.06	1.97	69.68
37±2 (31–40)	0.03	24.54	0.19	5.42	7.54	16.69	0.04	63.40
46±3 (41–50)	6.71	7.40	1.78	13.42	2.59	1.24	6.45	48.83
57±3 (51–60)	1.99	15.26	1.99	2.41	11.71	6.72	6.86	52.15
64±3 (61–70)	1.07	8.66	5.35	12.23	3.34	0.77	15.33	42.94
76±7 (71–92)	0.00	76.59	12.12	25.43	7.21	2.50	32.95	54.90