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Table 6 Participants accrual

From: A longitudinal study of tobacco use among American Indian and Alaska Native tribal college students

  Year in College  
Cohort Year Freshman Sophomore Junior Senior TOTAL
2009 - 10 250*     250
2010 - 11 250 137**    387
2011 - 12 250 137 96***   483
2012 - 13 250 137 96 67 550
2013 - 14 250 137 96 67 550
TOTAL      2,220
  1. * Based on our previous work with the tribal college students, we estimate that we will be able to successfully recruit 85% of the freshman cohort each year of this project.
  2. ** Tribal college students have a high dropout rate from freshman to sophomore year; we assume a 45% drop out rate.
  3. *** The dropout rate reduces in subsequent years, so we assume a 30% drop out rate in each subsequent year.
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