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Table 3 Results regarding the mediating role of dietary cost in the association between individual and household educational level and the DHD15-index and DASH score for participants within varying age groups

From: To what extent do dietary costs explain socio-economic differences in dietary behavior?

Independent variable Mediator Dependent variable ≤ 65 yearsa >  65 yearsb
Indirect effect Proportion mediated Indirect effect Proportion mediated
β Bootstrap 95%CI β Bootstrap 95%CI
  Dietary cost (€/d) DHD15- index (score) Individual educational level
Middle vs. low 0.07 −0.03; 0.20 N/A 0.25* 0.13; 0.40 6.9
High vs. low 0.07 −0.03; 0.20 N/A 0.27* 0.15; 0.41 3.3
High vs. Middle 0.01 −0.05; 0.07 N/A 0.02 −0.07; 0.11 N/A
  Household educational level
Middle vs. low 0.04 −0.04; 0.15 N/A 0.18* 0.08; 0.30 6.3
High vs. low 0.07 −0.07; 0.22 N/A 0.27* 0.15; 0.40 3.7
High vs. Middle   0.03 −0.03; 0.13 N/A 0.09* 0.02; 0.19 2.1
  DASH diet (score) Individual educational level
Middle vs. low 0.04* 0.01; 0.08 3.2 0.09* 0.06; 0.14 10.5
High vs. low 0.04* 0.01; 0.08 1.5 0.10* 0.07; 0.14 5.0
High vs. Middle 0.00 −0.03; 0.03 N/A 0.01 −0.02; 0.04 N/A
  Household educational level
Middle vs. low 0.02 −0.00; 0.06 N/A 0.07* 0.03; 0.10 10.0
High vs. low 0.05* 0.01; 0.09 1.9 0.10* 0.06; 0.14 5.8
High vs. Middle    0.02 −0.00; 0.06 N/A 0.03* 0.01; 0.07 2.9
  1. Abbreviations: B beta regression, CI confidence interval, N/A Not Applicable
  2. aN = 2413 and N = 2418 for individual and household educational level, respectively
  3. bN = 6862 and N = 6864 for individual and household educational level, respectively
  4. * P < 0•05
  5. All analyses were adjusted for energy intake, study center and sex.
  6. Proportion mediated was not calculated for non-significant indirect effects.