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Table 2 Baseline characteristics of the intervention and control group

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

Characteristic

Intervention group (n = 757) n (%)

Control group (n = 754) n (%)

Sex

male

489 (64.6)

468 (62.1)

female

268 (35.4)

286 (37.9)

(Doctor’s) degree

543 (71.7)

560 (74.3)

Type of practice

Group practice

225 (29.7)

245 (32.5)

Single practice

399 (52.7)

373 (49.5)

Ambulatory healthcare centre

13 (1.7)

14 (1.9)

Unknown/other

120 (15.9)

122 (16.2)