Table 2. Univariate analysis of predictive factors of motorcycle riding behavior.

Variables	Behavior Score
	Regression Coefficient	P-value
Age	-.45	.001
subscale A, ADHD	1.68	.001
subscale B, ADHD	2.02	.001
subscale D, ADHD	1.42	.001
Average hours of riding per day
2-4 hours	10.34	.009
4-6 hours	21.05	.001
6-8 hours	19.45	.002
More than 8 hours	-25.25	.23
Motor riding record
Less than 6 months	18.94	.001
6-12 months	13.53	.001
More than 12 months	.16	.001