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

Table 1 Characteristics of patients and control subjects

	HC	ADHD	TD	ASD
n	1997	1565	1694	93
(M/F)	(979/1018)	(1317/248)	(1282/412)	(83/10)
%	49.02/50.98	84.15/15.85	64.2/35.8	89.25/10.75
Age	8.57 ± 2.28	7.92 ± 1.85	7.61 ± 2.03	6.14 ± 2.88
Sex
Male	74.34 ± 51.19a	36.82 ± 20.64	35.72 ± 20.15	31.42 ± 18.58
Female	69.08 ± 52.64a	35.64 ± 18.56	34.54 ± 22.12	27.42 ± 13.73
SF	71.66 ± 51.99	36.63 ± 20.32	35.43 ± 20.64	30.99 ± 18.11
F (%)	8.61a	8.37a	11.04a	15.05a

^aP < 0.05.

HC: Healthy control; ADHD: Attention deficit hyperactivity disorder; TD: Tic disorder; ASD: Autism spectrum disorders; SF: Serum ferritin; F: Incidence of low serum ferritin.