RESUMEN
BACKGROUND: New Zealand's Bowel Screening Pilot (BSP) used a mailed invitation to return a faecal immunochemical test. As a pilot it offered opportunities to test interventions for reducing ethnic inequities in colorectal cancer screening prior to nationwide programme introduction. Small media interventions (e.g. educational material and DVDs) have been used at both community and participant level to improve uptake. We tested whether a DVD originally produced to raise community awareness among the Maori population would have a positive impact on participation and reduce the proportion of incorrectly performed tests (spoiled kits) if mailed out with the usual reminder letter. METHODS: The study was a parallel groups pseudo-randomised controlled trial. Over 12 months, all Maori and Pacific ethnicity non-responders four weeks after being mailed the test kit were allocated on alternate weeks to be sent, or not, the DVD intervention with the usual reminder letter. The objective was to determine changes in participation and spoiled kit rates in each ethnic group, determined three months from the date the reminder letter was sent. Participants and those recording the outcomes (receipt of a spoiled or non-spoiled test kit) were blinded to group assignment. RESULTS: 2333 Maori and 2938 Pacific people participated (11 withdrew). Those who were sent the DVD (1029 Maori and 1359 Pacific) were less likely to participate in screening than those who were not (1304 Maori and 1579 Pacific). Screening participation was reduced by 12.3% (95% CI 9.1-15.5%) in Maori (13.6% versus 25.9%) and 8.3% (95% CI 5.8-10.8%) in Pacific (10.1% versus 18.4%). However, spoiled kit rates (first return) were significantly higher among those not sent the DVD (33.1% versus 12.4% in Maori and 42.1% versus 21.9% in Pacific). CONCLUSION: The DVD sent with the reminder letter to BSP non-responders reduced screening participation to an extent that more than offset the lower rate of spoiled kits. TRIAL REGISTRATION: Australia and New Zealand Clinical Trials Registry ACTRN12612001259831 . Registered 30 November 2013.