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Table 1 Response information of the web and telephone survey with cooperation and response rates

From: Is web interviewing a good alternative to telephone interviewing? Findings from the International Tobacco Control (ITC) Netherlands Survey

  Web survey Telephone survey
Eligible* 2,331 592
Interviews 1,820 404
Refusals 511 113
Non-contact - 52
   • adult smoker in household - 3
- estimated to be eligible (97,1%) - 3
   • unknown if adult smoker in household - 49
- estimated to be eligible (22,4%) - 11
Other - 23
Ineligible** - 11,504
Eligibility unknown*** - 16,467
Unknown if housing unit - 5,220
- estimated to be eligible (22,4%) - 1,169
Housing unit - 11,247
   • adult smoker in household - 7,327
- estimated to be eligible (97,1%) - 7,115
   • unknown if adult smoker in household - 3,920
- estimated to be eligible (22,4%) - 878
Total attempted to contact 2,331 28,563
Cooperation rate† 78.1% 78.1%
Response rate‡ - 4.2%
  1. * Eligible cases included cases where an interview was completed, refusal occurred, non-contact at a residential household or where respondents were unable to complete the interview due to language difficulties or disability.
  2. ** Ineligible cases included non-residential numbers (such as business or fax lines) and telephone numbers which were invalid. Ineligible cases also included households with no adult monthly smokers of manufactured or roll-your-own cigarettes who have smoked at least 100 cigarettes in their lifetime.
  3. *** Cases where eligibility was unknown were recorded separately.
  4. † Cooperation rate was calculated according to the AAPOR definition COOP4 [35]. This was the number of interviews (404 for telephone) divided by the number of eligible respondents who were contacted and capable of doing the interview (404 + 113 for telephone).
  5. ‡ Response rate was calculated according to the AAPOR definition RR4 [35]. This was the number of interviews (404 for telephone) divided by the number of respondents who were eligible or estimated to be eligible (404 + 113 + 3 + 11 + 23 + 1,169 + 7,115 + 878 for telephone). Estimates of eligibility were made using the eligibility rate of the respondents from whom the eligibility was known. The eligibility rate of households with adults smokers was 97,1% and the eligibility rate of households of which it was unknown if there was an adult smoker was 22,4%. Response rate was not calculated for the web survey, since all respondents from the initial sample were contacted and eligible.