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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.