Many UTXOs created do not represent a sale or purchase of a given coin (these include relay transactions and change - for more details learn more about how UTXOs work). However, the original SOPR metric treats these as sale/purchase transactions between parties, adding noise to the metric.
As such, adjusted SOPR (aSOPR) filters out all UTXOs with a lifespan of less than an hour and thereby eliminates obvious relay transactions. In turn, this provides a more accurate signal of actual sale/purchase transactions.
Adjusted SOPR uses the same formula as SOPR, but simply filters out any UTXOs which are less than an hour old.
Renato Shirakashi - Introducing SOPR