Table 4.

ANOVA for the effects of paper sludge content and particle size on particleboard properties.

Properties		Corrected model	Intercept	A	B	A × B	Error	Total
MOE	df	20	1	0	15	0	63	84
	M S	1,315,418.686	315,028,905	–	881,803	–	89,375.77
	F	14.718	3524.769	–	9.866	–
	Sig.	–	–	< 0.000**	< 0.001**	< 0.000**
MOR	df	20	1	0	15	0	63	84
	M S	172.712	45,510.839	–	133.847	–	11.606
	F	14.881	3921.277	–	11.532	–
	Sig.	–	–	< 0.000**	< 0.001**	< 0.000**
IB	df	23	1	2	16	0	70	94
	M S	0.21	26.834	0.028	0.169	–	0.055
	F	3.838	489.996	0.509	3.084	–
	Sig.	0	0	0.604NS	0.001**	–
SWR edge	df	20	1	0	15	0	63	84
	M S	1172.306	185398.682	–	1317.393	–	39.825
	F	29.436	4655.285	–	33.079	–
	Sig.	0	0	< 0.000**	< 0.001**	< 0.000**
SWR face	df	20	1	0	15	0	63	84
	M S	1596.087	340697.51	–	1394.081	–	139.361
	F	11.453	2444.71	–	10.003	–
	Sig.	0	0	< 0.000**	< 0.001**	< 0.000**
Density	df	20	1	15	0	0	105	126
	M S	14,099.629	49,971,193.39	15010.4	–	–	1750.928
	F	8.053	28,539.835	8.573	–	–
	Sig.	0	0	< 0.000**	0	0
WA 2–h	df	20	1	0	15	0	105	126
	M S	2178.304	1,175,093.904	–	1856.94	–	91.813
	F	23.725	12,798.712	–	20.225	–
	Sig.	0	0	–	< 0.001**	–
WA 24-h	df	20	1	0	15	0	105	126
	M S	2334.15	1,498,847.588	–	2243.528	–	185.316
	F	12.596	8088.066	–	12.107	–
	Sig.	0	0	< 0.000**	< 0.001**	< 0.000**
TS 2-h	df	20	1	0	15	0	105	126
	M S	103.755	72,134.093	–	91.212	3222	5.316
	F	19.518	13,569.378	–	17.158	12.43
	Sig.	0	0	–	< 0.001**	< 0.000**
TS 24-h	df	20	1	0	15	0	105	126
	M S	174.011	90,531.194	–	165.308	–	8.526
	F	20.41	10,618.305	–	19.389	–
	Sig.	0	0	–	< 0.000**	–

A sludge content, B sludge particle size, df degree of freedom, MS mean of squares, SS sum of squares, F F value, ns not significant.

*Significant difference at the 5% level.

**Significant difference at the 1% level.