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Table 4 Predicted probability and 95% confidence intervals (CI) of receiving a completed survey

From: Effectiveness of incentives and follow-up on increasing survey response rates and participation in field studies

Sample size (n) Probability of completing survey and 95% CIs (%) Follow-up waves Survey length Survey incentive
207 21.7 (16.6–27.9) 3 Short $2
210 20.5 (15.6–26.5) 3 Medium $2
1041 16.3 (14.2–18.7) 3 Long $2
805 12.0 (10.0–14.5) 2 Long $2
219 8.2 (5.2–12.7) 0 Long $2
1094 3.1 (2.2–4.3) 0 Long Gift card
Total = 3576     
  1. Data stratified by number of follow-up waves, survey length and survey incentive. Data calculated excluding non-deliverable surveys