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<p>Perhaps more generically, the “level of applicant’s interest” thing, where colleges use it to reject students who appear to be using them as a “safety”. Applying ED signals a high level of interest, and presumably helps at such colleges, at least for high stats applicants who might otherwise be suspected of applying to the school as a “safety”.</p>
<p>Tufts itself does not consider “level of applicant’s interest”, according to <a href=“Tufts University Acceptance Rate | CollegeData”>https://www.collegedata.com/cs/data/college/college_pg02_tmpl.jhtml?schoolId=155</a> . It does not look like Tufts has past common data sets to see if “level of applicant’s interest” was considered in the past, when the “Tufts syndrome” reputation appeared.</p>