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Table 2 Association of socio-demographic characteristics and interviewer with the mode of SAQ completion (n = 192)

From: Mixing mixed-mode designs in a national health interview survey: a pilot study to assess the impact on the self-administered questionnaire non-response

OR (95% CI)OR (95% CI)
Age1.04 (1.01–1.07) *1.00 (0.97–1.03)
Men1.36 (0.65–2.84)0.97 (0.43–2.17)
Higher education level a0.89 (0.37–2.13)1.20 (0.47–3.04)
Country of birth: non-Belgium1.15 (0.37–3.55)0.89 (0.25–3.13)
Employment status (ref: non-employed) b
employed0.56 (0.21–1.51)0.87 (0.29–2.64)
student2.13 (0.35–12.99)1.34 (0.20–8.80)
Household size: 1+0.51 (0.24–1.10)0.66 (0.29–1.54)
Interviewer (ref: interviewer 1) c
Interviewer 20.52 (0.16–1.64)0.84 (0.21–3.32)
Interviewer 30.28 (0.08–0.96) *1.30 (0.34–4.99)
Interviewer 40.32 (0.10–1.05)0.15 (0.02–0.93)*
Interviewer 50.14 (0.03–0.62) *0.60 (0.12–2.98)
Nagelkerke R20.28 *
  1. A multinomial logistic regression model using SAS Proc Logistic with web SAQ as reference category
  2. *p value < 0.05; SAQ = self-administered questionnaire; P&P = paper-and-pencil
  3. a For students the education level equals the highest education level in the household. If this was not possible it was based on their current field of study
  4. b “Employed” refers to respondents who had a paid job for at least one hour a week at the moment of the interview, “Unemployed” refers to respondents without a paid job at the moment of the interview, “Student” refers to respondents who were (fulltime or part-time) enrolled in the regular education system at the moment of the interview. Students who had a (part-time) paid job were classified as students
  5. c Interviewer 6 had a refusal rate of 54.8% for the SAQ among the F2F respondents and had only 1 of 42 (2.4%) F2F respondents who completed the web SAQ. Therefore, this interviewer was considered as an outlier and was not considered in this analysis