The graph shows the top reported health impediments to MIT students’ academic performance. These results are from the National College Health Assessment research survey organized by the American College Health Association. The ACHA-NCHA survey was sent to MIT students in March 2006. Of the students invited to take the survey, the total response rate was 28 percent with 876 respondents. Additionally, women and freshmen were more likely to respond. Given the response rate and bias, the results “should be interpreted with caution,” according to information provided by Mandy D. Smith, research analyst in the Office of the Provost.