Table 1:

Parameters for the four-fiber family constitutive model describing the isochoric response of human FPAs in 7 age groups. Parameters represent the average FPA within each age group and are adjusted for the effects of flattening. Here n is the sample size in each age group that was used to derive these parameters. The coefficient of determination R²=0.99 for all age groups.

Age group (years)	n	Cgr(kPa)	$C_1^{\mathit{el}}(kPa)$	$C_2^{\mathit{el}}$	$C_1^{\mathit{smc}}(kPa)$	$C_2^{\mathit{smc}}$	$C_1^{\mathit{col}}(kPa)$	$C_1^{\mathit{col}}$	γ°
16.3 (11-20)	30	3.41	40.78	0.04	0.13	4.18	10.46	0.97	61.66
25.0 (21-30)	37	12.55	29.80	0.32	6.62	3.37	3.66	3.68	56.55
36.0 (31-40)	56	9.38	34.43	0.75	6.88	4.03	4.00	4.60	55.11
46.5 (41-50)	64	9.63	39.41	1.82	10.93	6.31	5.40	7.21	50.58
56.1 (51-60)	125	5.05	41.09	2.91	14.75	8.24	7.72	10.16	50.23
65.0 (61-70)	135	3.96	45.24	6.30	15.91	10.51	8.19	18.84	48.35
75.5 (70-80)	25	3.05	38.53	10.34	26.55	10.42	7.56	24.82	50.96