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Table 4 Results for items related to importance of several factors to reduce drop out of adolescents in a Web-based intervention to reduce binge drinking in 16- to 18-year-old adolescents

From: Web-based interventions to decrease alcohol use in adolescents: a Delphi study about increasing effectiveness and reducing drop-out

Strategy Second round Third round
  N = 56   N = 34  
  Mdn IQD Mdn IQD
1. *Monetary incentives 6 2.25 6 0.50
2. *Non-monetary incentives (e.g., movie tickets) 6 1 - -
3. *Reminder per e-mail 6 2.75 6 0.25
4. *Reminder per sms (text message) 6 2 6 0.25
5. *Engaging graphics 6 3 6 1
6. *Self-assessment with personalized feedback 6 2 6 1
7. *Use of highly relevant material 6 2 6 0
8. *Attractive design 6 2 6 0.25
9. *Inspiring topics 6 2 6 0.25
10. *Using language that relates to the adolescents 6 2 6 1
11. *Use as little text as you can get away with 6 2 6 0.50
12. *Use as much interaction as possible 6 2 6 0.50
13. Use of humor 5 3 5 1.50
14. *Engrossing website 6 1.75 6 0
15. The use of the website should be addictive itself 4 3 4 1.75
16. Give points to earn (e.g., game component) 5 2 5 2
17. Set little goals to achieve during the intervention 5 1 - -
  1. Mdn: median scores.
  2. IQD: interquartile deviation.
  3. -: these items had an IQD ≤ 1 in the second round and did not reappear in the third round.
  4. Strategies that are in italics and marked with an asterisk were identified as important (Mdn ≥ 6) and experts had reached consensus on (IQD ≤ 1).