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Table 3 Linear regression analysis of the association between diet quality indices and nutrient intakes in Iranian households (n = 6935)

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

Nutrients Overall
Mean (SD)
HEI DQI-I
β - Coeff 95% CI P-valuea β - Coeff 95% CI P-valuea
Energy (kcal/day) 2636 (695)       
Protein (% energy) 11.0 (1.75) 0.08 0.07, 0.09 < 0.001 0.09 0.08, 0.09 < 0.001
Fat (% energy) 24.6 (7.49) 0.26 0.23, 0.29 < 0.001 − 0.30 − 0.32, − 0.28 < 0.001
Sodium (mg/day) 2264 (2566) − 80.8 − 90.0, − 71.7 < 0.001 − 42.1 − 49.9, − 34.4 < 0.001
Fibre (g/day) 11.9 (4.92) 0.13 0.11, 0.15 < 0.001 0.31 0.29, 0.32 < 0.001
Iron (mg/day) 15.0 (5.02) 0.04 0.02, 0.06 < 0.001 0.32 0.31, 0.33 < 0.001
Calcium (mg/day) 594 (247) 12.5 11.6, 13.4 < 0.001 17.1 16.5, 17.7 < 0.001
Vitamin C (mg/day) 62.2 (49.3) 3.67 3.51, 3.82 < 0.001 2.9 2.8, 3.1 < 0.001
  1. Abbreviations: HEI Healthy Eating Index, DQI-I; Diet quality index international
  2. aAssociations between diet quality indices (continuous independent) and nutrient intakes (continuous dependent) were examined by using Wald tests of associations for linear regression