According to the initial plasma phenylalanine levels, four of the 21 patients belonged to classical phenylketonuria (PKU), seven were mild PKU, and ten were mild HPA.

• 依照初始血浆苯丙胺酸浓度可将病患分组，在21个病患中，有4人属于典型苯酮尿症，7人为轻型苯酮尿症，另外10人则是轻型苯丙胺酸血症。