Table 9. 3-way ANOVA analysis of delimbing operation using slope, height and felling direction factors by OWAS, RULA and REBA.

Item	Degree of freedom	OWAS		RULA		REBA
		F	p-value	F	p-value	F	p-value
Total	117
Slope (A)	1	1.960	0.164	0.040	0.843	0.077	0.782
Height1) (B)	2	41.518	<0.0001*	26.196	<0.0001*	12.385	<0.0001*
Felling direction (C)	1	4.197	0.043*	0.006	0.938	0.601	0.440
A × B	2	1.125	0.328	0.455	0.636	1.039	0.357
A × C	1	7.102	0.009*	0.080	0.777	1.147	0.287
B × C	2	0.334	0.717	0.598	0.552	0.277	0.759
Error	107

Felled tree height from the ground
p<0.05