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Table 3 Response to the study invitation and actual participation numbers (intervention and control group)

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

Sample

State

Total respondents

Interested respondents (n (%))

Respondents participating (n (%))

Intervention group (n = 757)

Baden-Wuerttemberg

74

49 (66.2%)

15 (20.3%)

Rhineland-Palatinate

33

22 (66.7%)

4 (12.1%)

Saarland

5

3 (60.0%)

2 (66.7%)

Total

112

74 (66.1%)

21 (18.8%)

Control group (n = 754)

Baden-Wuerttemberg

59

40 (67.8%)

11 (18.6%)

Rhineland-Palatinate

25

18 (72.0%)

6 (24.0%)

Saarland

6

6 (100.0%)

1 (16.7%)

Total

90

64 (71.1%)

18 (20.0%)