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

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

Hydrocephalus diagnoses (ICD-8 and ICD-10 codes)a N (201) Median age at diagnosis OR 95% CI P-value
Obstructive hydrocephalusb (G911) 67 8.3 5.89 (3.02–12.10) <4.0E−5
Communicating hydrocephalusb (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 specifiedb (G918, G919) 31 2.7 - -
  1. The more recent and more specific ICD-10 system diagnoses was ranked than the ICD-8 diagnoses
  2. aIn case of more than one hydrocephalus diagnosis, the more specific diagnosis was ranking higher
  3. 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)