Fig. 2From: The incidence of hydrocephalus among patients with and without spinal muscular atrophy (SMA): Results from a US electronic health records studyAge at index date among SMA cases (n = 42) and non-SMA matched controls (n = 9) with hydrocephalus. Index date = date of first SMA diagnostic code for cases and a matched date for non-SMA controls. SMA spinal muscular atrophyBack to article page