Table 3:

Parameters for the four-fiber family constitutive model describing the median response of human PAs 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)	0.02	23.27	0.18	0.57	6.21	19.11	1.24	65.71
26±4 (21–30)	3.32	8.61	0.32	2.00	5.83	4.74	2.92	64.45
37±2 (31–40)	9.51	11.26	1.03	8.48	10.79	3.08	7.48	58.89
46±3 (41–50)	3.25	17.83	1.56	22.45	5.34	5.80	6.94	51.13
57±3 (51–60)	4.66	19.61	3.68	9.51	14.31	4.85	14.98	49.05
64±3 (61–70)	3.49	16.84	7.33	9.02	13.17	4.24	20.49	50.39
76±7 (71–92)	0.00	89.47	23.42	33.66	17.94	16.00	42.52	49.12