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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.