Table 4.
Multivariate analysis and Duncan multiple range test of properties of plywood bonded with UF resins at different initial F/U mole ratios and synthesis methods

Properties	F-value	P-value	R2	2nd initial F/U mole ratio	1st initial F/U mole ratio
					2.0	3.0	4.0
					TSS (MPa)	1.31	0.337	0.30	2.0	0.95 (a)*	1.03 (a)	1.00 (a)
FE (mg/L)	231.46	0.001	0.98	1.89 (c)	1.22 (a)	1.64 (b)
TSS (MPa)	19.62	0.002	0.87	1.7	0.76 (b)	1.10 (a)	1.21 (a)
FE (mg/L)	48.67	0.001	0.94		1.20 (c)	0.81 (b)	0.55 (a)

TSS : tensile shear strength
FE : formaldehyde emission
The mean value with different letters are statistically different at P-value less than 0.05