Role of soluble alpha-klotho as a novel biomarker for characterizing children with autism spectrum disorder in Kurdistan, Iraq

Table 1 Demographic features for control and autism spectrum disorder groups

Demographic features	Control group		ASD group
	Frequency	%	Frequency	%
Aged (year)
2-5	15	15	34	22
6-10	50	50	84	54
11-15	35	35	38	24
Sex
Boys	55	55	128	82
Girls	45	45	28	18
Family history
Yes	-	0	21	14
No	No	100	129	86
Experiencing complications at birth
Yes	31	31	83	53
No	69	96	73	47
Time of birth (weeks)
Early birth (< 37)	21	21	57	38
Normal birth (37-42)	67	67	42	28
Late birth (≥ 42)	12	12	51	34
Birth weight (kg)
Low (< 2.5)	8	8	49	33
Normal (2.5-4)	63	63	47	31
High (> 4)	19	19	54	36

ASD: Autism spectrum disorder.