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Table 1 Numbers of fax letters sent out/delivered in the intervention and control group

From: Effects of personalized invitation letters on research participation among general practitioners: a randomized trial

Sample

State

Letters sent out

Letters delivered successfully

Intervention group

Baden-Wuerttemberg

455

426 (93.6%)

Rhineland-Palatinate

297

283 (95.3%)

Saarland

54

48 (88.9%)

Total

806

757 (93.9%)

Control group

Baden-Wuerttemberg

447

425 (95.1%)

Rhineland-Palatinate

299

278 (93.0%)

Saarland

55

51 (92.7%)

Total

801

754 (94.1%)