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Table 3 Correlation coefficients for the food frequency questionnaires (FFQ1 and FFQ2) and assisted food records (FRs) for comparative validity

From: Reproducibility and comparative validity of a food frequency questionnaire for Australian children and adolescents

Energy & Nutrients Average of FFQ1 and FFQ2 vs Assisted FRs
(n = 101)
FFQ2 vs Assisted FRs
(n = 113)
  Unadjusted (crude) Transformed De-attenuated, transformed Energy-adjusted, transformed De-attenuated, Energy-adjusted, transformed Unadjusted (crude) Transformed De-attenuated, transformed Energy-adjusted, transformed De-attenuated, Energy-adjusted, transformed
Energy (kJ) 0.29 ** 0.29 ** 0.32 - - 0.21 * 0.20 * 0.22 - -
Protein (g) 0.27 * 0.27 * 0.32 0.25 * 0.29 0.15 0.15 0.18 0.22 * 0.26
Fat (g) 0.34 ** 0.34 ** 0.39 0.30 ** 0.34 0.27 ** 0.27 ** 0.31 0.46 ** 0.53
Sat Fat (g) 0.39 ** 0.39 ** 0.44 0.41 ** 0.46 0.33 ** 0.31 ** 0.35 0.46 ** 0.52
Poly Fat (g) 0.20 * 0.20 * 0.25 0.03 0.04 0.14 0.16 0.20 0.17 0.21
Mono Fat (g) 0.28 ** 0.31 ** 0.36 0.18 0.21 0.25 * 0.26 ** 0.30 0.38 ** 0.44
Carbohydrate (g) 0.25 * 0.26 * 0.29 0.26 * 0.29 0.23 * 0.22 * 0.24 0.42 ** 0.47
Sugars (g) 0.25 * 0.27 * 0.30 0.22 * 0.25 0.24 * 0.27 ** 0.30 0.37 ** 0.41
Fibre (g) 0.44 ** 0.42 ** 0.48 0.37 ** 0.42 0.29 ** 0.29 ** 0.33 0.31 ** 0.35
Thiamin (mg) 0.36 ** 0.41 0.45 0.31 ** 0.34 0.19 * 0.23 * 0.26 0.31 ** 0.35
Riboflavin (mg) 0.38 ** 0.45 ** 0.51 0.46 ** 0.52 0.25 * 0.30 ** 0.34 0.47 ** 0.53
Niacin (mg) 0.28 ** 0.31 ** 0.36 0.21 * 0.24 0.12 0.14 0.16 0.18 0.21
Niacin equiv (mg) 0.31 ** 0.29 ** 0.33 0.19 0.22 0.13 0.13 0.15 0.15 0.17
Vitamin C (mg) 0.25 * 0.25 * 0.28 0.36 ** 0.41 0.28 ** 0.29 ** 0.33 0.42 ** 0.48
Folate (μg) 0.46 ** 0.50 ** 0.55 0.48 ** 0.53 0.25 * 0.31 ** 0.34 0.46 ** 0.51
Vitamin A (μg) 0.28 ** 0.31 ** 0.36 0.25 * 0.29 0.19 0.18 0.21 0.24 * 0.27
Retinol (μg) 0.17 0.22 * 0.25 0.03 0.03 0.09 0.08 0.09 0.03 0.03
Betacarotene (μg) 0.27 * 0.36 ** 0.42 0.41 ** 0.48 0.29 ** 0.30 ** 0.34 0.39 ** 0.45
Magnesium (mg) 0.38 ** 0.40 ** 0.44 0.50 ** 0.55 0.28 ** 0.28 ** 0.31 0.51 ** 0.56
Calcium (mg) 0.43 ** 0.47 ** 0.52 0.51 ** 0.56 0.35 ** 0.37 ** 0.41 0.46 ** 0.51
Iron (mg) 0.44 ** 0.42 ** 0.46 0.39 ** 0.43 0.34 ** 0.33 ** 0.37 0.46 ** 0.51
Zinc (mg) 0.28 ** 0.26 * 0.31 0.25 * 0.30 0.18 0.15 0.18 0.27 ** 0.32
Measure of central tendency 0.285 § 0.34 §§ 0.38 §§ 0.30 §§ 0.34 §§ 0.245 § 0.24 §§ 0.27 §§ 0.34 §§ 0.39 §§
  1. Spearmans correlations undertaken in unadjusted (crude) data. Pearsons correlations undertaken on all other data (square-root transformed).
  2. * denotes p-value < 0.05; ** denotes p-value < 0.01; § denotes median; §§ denotes mean.
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