A curious finding invites speculation: People in the eastern part of the United States remain in treatment longer than those in the western part (“Fee, Practice, and Managed Care Survey,” 2000). This is merely a correlation. One possible explanation is that people in the eastern part have a different definition of “improvement”; that is, they continue in treatment until their symptoms have improved more than those of their counterparts in the western part of the country. However, there are other possible explanations; perhaps you can think of some.
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