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Table 4 Multiple linear regression analysis of the associations between sociodemographics and diet quality indices in Iranian households (n = 6935)

From: A comparison of diet quality indices in a nationally representative cross-sectional study of Iranian households

Characteristics HEI DQI-I
β - Coeff 95% CI P-valuec β - Coeff 95% CI P-valuec
Age of household heada
 Young age (reference)
 Middle-aged 1.49 1.12, 1.86 < 0.001 1.45 0.97, 1.92 < 0.001
 Older 2.06 1.63, 2.50 < 0.001 2.90 2.34, 3.45 < 0.001
Sex of household head
 Males (reference)
 Females −0.89 −1.56, −0.21 0.010 −0.86 1.76, − 0.01 0.052
Level of education of household headb
 Low (reference)
 Moderate 2.40 2.07, 2.74 < 0.001 0.39 −0.04, 0.82 0.077
 High 4.54 4.02, 5.06 < 0.001 2.11 1.45, 2.77 < 0.001
Area of residence
 Rural (reference)
 Urban 2.85 2.54, 3.16 < 0.001 0.72 0.32, 1.12 < 0.001
Household size
 Less than 5 members (reference)
 5 or more members −0.95 −1.29, −0.63 < 0.001 0.38 −0.03, 0.79 0.069
  1. Abbreviations: HEI Healthy Eating Index, DQI-I Diet quality index international
  2. aYoung age (18–36 years old), middle aged (> 36–56 years old), older (> 56 years old)
  3. blow (no formal schooling, less than primary school, the primary school completed), medium (secondary school completed, high school completed), and high (college/university completed)
  4. cAssociations between sociodemographic characteristics (categorical independent) and diet quality indices (continuous dependent) were examined by using Wald tests of associations for linear regression. All sociodemographic characteristics were included in the same model