It all depends on how you perceive the risk figure given. Basically if there were 653 women with the same results as you, one woman would have a child with Down Syndrome and 652 women would have a child without Down Syndrome.
The 1/300 'high risk' figure is based on the risk of termination if subsequent diagnostice tests are performed. CVS has a theoretical risk of 1/100 and Amnio a risk of 1/200 of the pregnancy terminating post procedure. In Aust, the risks are probably lower than this and the more experienced the operator the risk goes down again. The 1/300 'high risk' figure is used because above this, people are taking a greater chance of losing their pregnancy through having testing than the risk is of them having a child with Down syndrome (or other chromosomal variation).
One woman may see 1/450 as a great figure, where another will become concerned by this value. That is why woman are generally given the actual numbers and not just a category.
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