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Table 2 How screened and randomised participants reported hearing about the study

From: Recruitment of men to a multi-centre diabetes prevention trial: an evaluation of traditional and online promotional strategies

How men reported hearing about the study1 Description of associated recruitment promotions2 # Screened # Randomised (%)3 Contribution (%)4
Radio advertising 7110 × 30-s paid advertisement placements across 20 radio stations 7667 418 (5%) 42%
TV news 8 television news stories (6 national and 2 in single cities) 4127 202 (5%) 20%
Mail-out by DHS 130,000 invitation letters posted to government mailing list 3211 173 (5%) 17%
Community promotions Posters, community events, promotion on other organisations’ websites, newsletters and Facebook pages 998 43 (4%) 4%
Word of mouth (not otherwise specified) N/A 491 34 (7%) 3%
Newspaper news 9 newspaper stories (3 major newspapers, 3 local newspapers, 2 online news sites, 1 professional magazine) 622 31 (5%) 3%
Healthcare provider 1024 GP clinics mailed, attendance at GP events, distribution of posters to pathology collection centres, GPs, clinics and hospitals 450 29 (6%) 3%
Facebook 94 unpaid Facebook posts, 23 paid Facebook advertisements and boosted posts, requests to participants and organisations to share study on Facebook 369 16 (4%) 2%
Other internet Three Google AdWords campaigns, study website, links on other websites 410 15 (4%) 1%
Radio news 7 radio news stories (all in single cities) 182 10 (5%) 1%
Mail-out by GP Invitations mailed from GP clinic near to one study site. Number of invitations sent not known 47 1 (2%) 0%
Newspaper advertising 1 advertisement in a Sunday paper in 1 city 33 1 (3%) 0%
Football club promotion Email newsletter and 1 week of website advertising at one football club near to 1 study site 5 0 (0%) 0%
Not specified N/A 410 34 (8%) 3%
Total   19,022 1007 (5%) 100%
  1. DHS Department of Human Services, GP general practitioner, N/A not applicable
  2. 1Where a participant reported hearing about the study from multiple sources only the primary source is shown
  3. 2Unless otherwise specified, strategies were implemented across all study sites
  4. 3Percentage of screened participants who went on to be randomised to the study
  5. 4Contribution defined as the percentage of all participants randomised who were randomised from a particular source
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