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Table 1 sequence and location of the sub studies recruitment activities 2002 - 2006

From: Recruiting and motivating black subjects to complete a lengthy survey in a large cohort study: an exploration of different strategies

 

West Coast

Mid-America

Great Lakes

North East

Allegheny East

South/Florida

South West

Initial promotion

6/2002 – 7/2003

5/2003 – 12/2003

01/2004- 6/2004

5/2004 – 12/2004

05/2004 – 12/2004

7/2004 – 6/2005

07/2005- 6/2006

Telephone follow-up

1/2003 – 6/2003

      

Black Art

     

06/2003- 12/2003

 

Operation 30,000

5/2005 – 10/2005

5/2005 – 10/2005

5/2005 – 10/2005

5/2005 – 10/2005

   

Student recruiters*

12/2002 –10/2005

    

6/2004 – 9/2004

 

Local recruiters

04/2006 -10/2006

04/2006 -10/2006

     

Tournament of Healing

    

05/2006 – 08/2006

  

Lake Region $20

  

05/2006 -08/2006

    

$2/$10**

1/2006 – 4/2006

1/2006 – 4/2006

1/2006 – 4/2006

1/2006 – 4/2006

1/2006 – 4/2006

1/2006 – 4/2006

1/2006 – 4/2006

  1. *Of the 9 matched sets of 5 churches, one on the West Coast overlapped with Operation 30,000 (in this set intervention did no better than controls). Operation 30,000 will have affected intervention and control churches equally and should have caused no bias.
  2. **The apparent overlap in time between the $2/$10 sub-study with Local recruiters is only of trivial magnitude as the $2/$10 was not church- but individual subject-based. It affected only 1000 randomly selected subjects out of 80,000 enrolled, and affected equally both control and intervention churches of other sub-studies.