Table 2.

Constitutive parameters for all FPAs. N is sample size per age group that was used to derive these parameters.

Age group, years	n	Mean age, years	Cgr (kPa)	$C_1^{el}$ (kPa)	$C_2^{el}$	$C_2^{\mathit{smc}}$ (kPa)	$C_2^{\mathit{smc}}$	$C_1^{\mathit{col}}$ (kPa)	$C_2^{\mathit{col}}$	γ (°)
11–20	34	16.5	10.59	21.05	0.21	2.94	2.20	3.83	2.08	60.95
21–30	31	24.8	14.02	15.86	0.49	4.52	4.17	2.52	4.06	55.49
31–40	56	35.7	11.57	17.07	0.91	4.86	3.72	1.96	4.90	57.38
41–50	73	46.8	13.20	17.69	1.98	7.93	7.82	2.32	10.11	49.22
51–60	174	56.1	13.48	20.35	4.09	12.21	11.56	3.55	15.39	47.81
61–70	162	65.0	7.31	23.90	5.76	14.21	12.94	5.23	21.35	46.64
71–80	43	75.7	6.88	33.28	11.59	32.71	15.24	8.87	34.32	44.96