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Table 2 Correlations between sqFFQ and WFR (n = 91); correlations for reproducibility of sqFFQ (n = 20)

From: Relative validity of a semi-quantitative food frequency questionnaire for Singaporean toddlers aged 15–36 months

  Before calibration After calibration
Pearson’s ra Deattenuated correlationa Intra-class coefficient (ICC) for sqFFQ1 and sqFFQ2)a Pearson’s ra Deattenuated correlationab Intra-class coefficient (ICC) for sqFFQ1 and sqFFQ2)a b
 Total energy 0.39 0.54 0.79 0.57 0.65 0.79
 Protein 0.35 0.46 0.87 0.46 0.47 0.42
 Total fat 0.28 0.47 0.80 0.42 0.38 0.34
 SFA 0.19 0.30 0.84 0.21 −0.70
 MUFA 0.18 0.30 0.86 0.29 0.43 0.15
 PUFA 0.35 0.60 0.91 0.49 0.74 0.35
 DHA 0.37 0.54 1.00 0.34 0.40 0.22
 Total CHO 0.32 0.44 0.77 0.51 0.58 0.84
 Sugars 0.42 0.56 0.97 0.52 0.62 0.42
 Fibre 0.56 0.84 0.61 0.57 0.71 0.49
Vitamins
 A 0.26 0.36 0.99 0.40 0.51 0.34
 B1 0.50 0.64 0.91 0.48 0.38
 B2 0.53 0.60 0.97 0.52 0.56 0.76
 B3 0.38 0.50 0.87 0.38 0.43 0.09
 DFE 0.41 0.56 0.92 0.49 0.54 0.76
 B12 0.57 0.67 0.96 0.56 0.63 0.74
 C 0.48 0.60 0.96 0.51 0.65 0.42
 E 0.25 0.33 0.95 0.23 0.27 0.10
Minerals
 Ca 0.62 0.72 0.97 0.63 0.71 0.59
 Fe 0.56 0.67 0.87 0.59 0.62 0.52
 I 0.28 0.41 0.92 0.29 0.41 0.16
 K 0.47 0.61 0.90 0.51 0.54 0.37
 Mg 0.45 0.58 0.83 0.55 0.61 0.46
 P 0.45 0.58 0.87 0.55 0.64 0.44
 Na 0.47 0.74 0.84 0.47 0.67 0.35
 Zn 0.42 0.51 0.96 0.46 0.55 0.35
  1. sqFFQ1, first administration of sqFFQ (also used for validation); sqFFQ2, second administration of sqFFQ; ICC model was two- way mixed model, single measurement type, with absolute agreement definition
  2. aCorrelations statistically significant (p < 0.01)
  3. bAfter calibration, deattenuated correlation could not be computed for SFA and B1; ICC n.s. for total fat, saturated fat, B3 and vitamin E and iodine