Table 3.

The influence of median split point and handedness categorization system on significant consistency of handedness differences found on the BIS/BAS scales.

Scale	Finding*	EHI85 Split	EHI80 Split	EHI75 Split	EHI70 Split
Two categories
FFFS	CH > IH	0.001
BIS	CH > IH	0.006	0.035	0.011
BAS-FS	IH > CH	0.009	0.029	0.020
Three categories
FFFS	CR > IH	0.002
BIS	CL > IH	0.001	0.046	0.005	0.014
	CL > CR	0.018
BAS-FS	IH > CL	0.005	0.011	0.007
BAS-RR	CL > CR			0.037	0.009
	CL > IH				0.046
Four categories**
FFFS	CR > IL	0.008
	CR > IR	0.035
BIS	CL > CR	0.036
	CL > IL	0.010
	CL > IR	0.001	ns	0.007	0.038
BAS-FS	IL > CL	0.019	0.028	0.017
	IR > CL	0.013	0.037	0.031
BAS-RR	CL > CR				0.019

*CH, consistent handers; IH, inconsistent handers; CL, consistent left-handers; CR, consistent right-handers; IL, inconsistent left-handers; IR, inconsistent right-handers.

**Six individuals who had an EHI score of 0 could not be assigned a direction (left or right) and were removed from the four category analyses.