Patient Characteristics
The average age at onset is 3–7 years, but CVS has been seen in infants who are as young as 6 days and in adults who are as old as 73 years. Typical delay in diagnosis from onset of symptoms is 2.7 – 3 years. Females show a slight predominance over males; the female-to-male ratio is 57:43. CVS occurs in all races but seems to disproportionately affect Caucasians.
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