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

Table 4 Odds ratio of attention deficit hyperactivity disorder/tic disorder for low serum ferritin among children

	Model 1, OR (95%CI)	Model 2, OR (95%CI)	Model 3, OR (95%CI)
Among children with ADHD
ADHD	0.94 (0.74-1.19)	0.90 (0.71-1.15)	0.82 (0.63-1.06)
Age		0.68 (0.46-1.01)	0.68 (0.46-1.01)
Sex			1.22 (0.94-1.58)
Among children with TD
TD	0.97 (0.77-1.22)	0.91 (0.72-1.15)	0.99 (0.78-1.28)
Age		0.65 (0.93-1.56)	0.65 (0.95-1.53)
Sex			1.38 (1.08-1.75)

ADHD: Attention deficit hyperactivity disorder; TD: Tic disorder; OR: Odds ratio. 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.