Co-occurring hydrocephalus in autism spectrum disorder: a Danish population-based cohort study

Table 4 Median age at hydrocephalus diagnosis, and association with autism spectrum disorder, according to ICD-subtype distribution of hydrocephalus

Hydrocephalus diagnoses (ICD-8 and ICD-10 codes)^a	N (201)	Median age at diagnosis	OR 95% CI	P-value
Obstructive hydrocephalus^b (G911)	67	8.3	5.89 (3.02–12.10)	<4.0E−5
Communicating hydrocephalus^b (G910, G912)	17	18.4	-	-
Congenital hydrocephalus (74200, 74201, 74208, 74209, Q038x, Q039)	79	0.8	2.50 (1.30–4.84)	0.0067
Post traumatic/acquired hydrocephalus (34794, G913)	7	2.3	-	-
Hydrocephalus, not specified^b (G918, G919)	31	2.7	-	-

The more recent and more specific ICD-10 system diagnoses was ranked than the ICD-8 diagnoses
^aIn case of more than one hydrocephalus diagnosis, the more specific diagnosis was ranking higher
^bCongenital (Q), or likely to be congenital due to the low median age at hydrocephalus diagnosis and the young age of the study population (G)

ISSN: 1866-1955