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Table 2 Demographic characteristics for all respondents among participating households stratified by experimental group

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

  Individual Respondents in Incentive Group n=255 (for education, n=213) Individual Respondents in Non-Incentive Group n=176 (for education, n=148) Incentive vs. Non-Incentive Between Group Difference (95% Confidence Interval)
Non-response on income 31.4% 33.0% −1.6% (−10.6%, 7.4%)
Living at or below the low income cut-off 1 33.7% 22.9% 10.8% (0.5%, 21.2%)
Non-response on education (adults only) 11.3% 7.4% 3.8% (−2.2%, 9.8%)
Not a post-secondary graduate 2 32.8% 40.1% −7.3% (−17.9%, 3.2%)
Non-response on birthplace 7.1% 4.0% 3.1% (−1.2%, 7.3%)
Born outside Canada 3 46.0% 45.0% 1.0% (−8.8%, 10.8%)
  1. 1 Individuals living at or below the low income cut-off are representative of those of “lower SES”.
  2. 2 Non post-secondary graduates are representative of those of “lower education”.
  3. 3 Individuals born outside Canada are representative of “new Canadians”.