Table 6:

Parameters of the four-fiber family constitutive model describing the 25^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)	7.02	26.84	0.30	0.22	9.52	12.69	3.75	67.25
26±4 (21–30)	13.20	5.16	0.87	7.41	7.94	0.13	12.65	58.32
37±2 (31–40)	17.13	2.20	6.67	10.36	24.68	3.70	21.40	60.81
46±3 (41–50)	0.09	0.14	3.46	9.64	30.57	41.17	3.47	33.55
57±3 (51–60)	0.01	46.16	6.94	56.70	47.68	28.27	28.91	53.52
64±3 (61–70)	32.47	13.30	25.61	30.40	36.54	0.39	126.52	47.68
76±7 (71–92)	0.00	111.55	63.11	71.18	80.59	90.67	155.09	54.48