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Table 1 Response rates to receive invitation in main trial between those receiving versus not receiving a primer letter

From: A randomized controlled trial of the effectiveness of a pre-recruitment primer letter to increase participation in a study of colorectal screening and surveillance

  Response type  
  Consentn (%) Refusaln (%) No responsen (%) Total
Primer letter 207 (40%) 131 (25%) 181 (35%) 519
Control 218 (40%) 112 (21%) 213 (39%) 543
Total 425 243 394 1,062