Serum ferritin levels in children with attention deficit hyperactivity disorder and tic disorder

Table 3 The β of attention deficit hyperactivity disorder/tic disorder for the level of serum ferritin among children

	Model 1		Model 2		Model 3
	β	P	β	P	β	P
Among children with ADHD
ADHD	-0.107	< 0.001	-0.107	< 0.001	-0.110	< 0.001
Age			0.011	< 0.001	0.011	< 0.001
Sex					0.021	< 0.001
Among children with TD
TD	-0.113	< 0.001	-0.108	< 0.001	-0.114	< 0.001
Age			0.001	< 0.001	0.010	< 0.001
Sex					0.021	< 0.001

Model 1 was not adjusted for any other variables; Model 2 was further adjusted for age; Model 3 was further adjusted for age and sex. ADHD: Attention deficit hyperactivity disorder; TD: Tic disorder.