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Table 1 Final dispositions for all households in each group

From: The use of incentives in vulnerable populations for a telephone survey: a randomized controlled trial

Final Disposition Number of Households in Incentive Group (%) n=364 Number of Households in Non-Incentive Group (%) n=364 Between Group Difference (95% Confidence Interval)
Completed Interviews 100 (27.5%) 78 (21.4%) 6.0% (−0.2%, 12.3%)
Language Problem 1 29 (8.0%) 26 (7.1%) 0.8% (−3.0%, 4.7%)
Partial Interview 2 5 (1.4%) 6 (1.6%) −0.3% (−2.0%, 1.5%)
Problem With Number 3 38 (10.4%) 45 (12.4%) −1.9% (−6.5%, 2.7%)
Non Contact 4 53 (14.6%) 59 (16.2%) −1.6% (−6.9%, 3.6%)
Abbreviated Questionnaire 5 26 (7.1%) 27 (7.4%) −0.3% (−4.0%, 3.5%)
Refusal 93 (25.5%) 102 (28.0%) −2.5% (−8.9%, 4.0%)
Wrong Address 6 17 (4.7%) 18 (4.9%) −0.3% (−3.4%, 2.8%)
No Qualified Sample 7 3 (0.8%) 3 (0.8%) 0.0 (−1.3, 1.3)
  1. 1 Language problem refers to a respondent who was not fluent in French or English and could therefore not complete the survey.
  2. 2 Partial interview refers to a respondent who, after beginning the interview, could not finish the entire survey. Partially interviewed subjects all needed to confirm that the given information could be used in research analysis.
  3. 3 Problem with number refers to numbers which were out of service, fax machine numbers or business telephone numbers.
  4. 4 Non-Contact refers to respondents who were never reached.
  5. 5 Abbreviated questionnaire refers to respondents who refused to complete the full interview but who agreed to answer a short series of condensed questions. The abbreviated questionnaire asked if anyone in the household had a food allergy and if the answer was yes, a short series of demographic questions were asked.
  6. 6 Wrong address refers to letters which were returned due to a wrong address; these households were therefore never contacted.
  7. 7 No qualified sample refers to households where no eligible participants resided.