The value of GP endorsement on participation in rescreening for colorectal cancer

Interventions: The aim is to determine the value of GP endorsement for faecal occult blood test based re-screening colorectal cancer. The interventions are conducted within the setting of a population screening program where invitees are recruited from general practice patient lists.
Intervention 1: Invitation letter to re-screen on central screening facility letterhead with statement from invitee’s general practice endorsing participation in screening, signed by screening coordinator.
Intervention 2: Invitation letter to rescreen on practice letterhead with statement from practice endorsing screening, signed by invitee’s general practitioner.
Comparison group: recruited from electoral roll receiving control invitation to rescreen.
Duration: Four annual rounds of screening offers.
All people received the same invitation type over the 4 rounds of screening invitations.
Primary outcome(s): Paricipation in screening defined as return of a screening kit 12 weeks from offer.[]
Study Design: Purpose: Prevention; Allocation: Randomised controlled trial; Masking: Blinded (masking used);Assignment: Parallel;Type of endpoint: Efficacy