. 2020 Sep 11;8:655. doi: 10.3389/fchem.2020.00655

Table 5.

Compression strength and modulus of reference and composite hydrogels evaluated at two strain values of 30 and 50 %, and a linear regression model which shows the impact of material composition on the properties.

Sample	Compressive strength (kPa)		Compression modulus (kPa)
	At 30% strain	At 50% strain	At 30% strain	At 50% strain
P₅C₀	0.70 ± 0.12	2.14 ± 0.28	4.56 ± 0.67	10.74 ± 0.45
P₅C₁	0.64 ± 0.02 (NS)	2.42 ± 0.26 (NS)	4.58 ± 0.48 (NS)	15.90 ± 1.38 (S) ↑
P₅C₁₀	0.83 ± 0.17 (NS)	2.61 ± 0.37 (S) ↑	5.23 ± 0.78 (NS)	17.65 ± 3.90 (S) ↑
P₁₀C₀	5.67 ± 0.61	25.66 ± 2.81	51.74 ± 4.97	183.46 ± 14.46
P₁₀C₁	9.47 ± 0.68 (S) ↑	38.13 ± 3.16 (S) ↑	72.62 ± 5.65 (S) ↑	233.19 ± 9.88 (S) ↑
P₁₀C₁₀	7.34 ± 1.11 (S) ↑	29.55 ± 5.53 (NS)	56.01 ± 5.97 (NS)	150.26 ± 26.56 (S) ↓
LRA
X₁ =P,	σ_30% = −6.09 + 1.35 X₁ + 0.01 X₂		E_30% = −49.80 + 11.07 X₁ – 0.20 X₂
X₂ = C	σ_50% = −26.15 + 5.75 X₁ – 0.05 X₂		E_50% = −149.99 + 34.84 X₁ – 2.58 X₂

S corresponds to significant change (at probability level 0.05), NS corresponds to non-significant change (at probability level 0.05), and arrows show the significant trends in behavior: ↑ corresponds to improvement and ↓ corresponds to decline.