Boston public health officials said Tuesday they have revised downward their estimate of the number of people injured in the marathon attacks, to 264.

A spokesman for the Boston Public Health Commission had said Monday that state health officials had counted 282 people who were injured and treated at Greater Boston hospitals, as of Saturday.

Why did the number decrease?

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“It turns out that we had double-counted some patients that were transferred from one hospital to another, so we reviewed our spreadsheets and cleaned up the duplicates,” said Nick Martin, the commission spokesman.

Check out this Globe story for more details on why the injury count has risen over the past several days and the status of the two patients still on the critical list.