From: Recruiting patients cost-effectively by mail
Centrally-held register
GP practices (Local register)
Others*
Total
Invitations sent
300,188
120,875
2223
423,286
Patients enter run-in
16104
9,741
635
26480
Patients randomised
9013 (3.0%)
6038 (5.0%)
430 (19.3%)
15481 (3.7%)