Figure 1From: Clinical and neurocognitive outcome in symptomatic isovaleric acidemiaStudy design. Sixteen of a total of 21 study patients with symptomatic isovaleric acidemia (IVA) were evaluated not only by use of a questionnaire and/or medical records (step I) but also by cross-sectional clinical, biochemical, and neurocognitive assessments (step II). IQ = intelligence quotient.Back to article page