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Table 3 Median, 25th and 75th percentiles for each nutrient measured by the sqFFQ and WFR (n = 91)a

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

  WFRb sqFFQb Calibrated sqFFQc
Median 25th 75th Median 25th 75th Median 25th 75th
 Total energy (kJ) 4608 3659 5653 6178 5405 8173 4629 3958 5121
 protein (g) 40.8 30.4 58.1 57.0 47.0 70.8 43.6 38.8 51.2
 total fat (g) 36.7 29.0 43.7 42.8 35.4 55.5 37.2 33.3 40.6
 SFA (g) 14.8 11.8 17.7 16.5 12.9 21.1 15.1 14.5 15.9
 MUFA (g) 14.1 12.9 17.3 17.1 13.1 21.6 14.5 13.2 15.6
 PUFA (g) 6.1 5.0 8.4 8.6 5.9 10.1 6.8 5.9 7.7
 DHA (g) 0.10 0.04 0.22 2.80 0.29 4.16 0.12 0.09 0.19
 total CHO (g) 143 108 175 214 176 280 145 121 160
 sugars (g) 63.7 46.7 85.5 93.8 62.3 130 65.5 56.1 72.9
 fibre (g) 8.0 5.8 11.2 14.7 10.9 16.9 7.5 6.5 9.0
Vitamins
 A (μg) 591 413 808 629 484 860 692 600 831
 B1 (mg) 1.0 0.6 1.2 1.2 0.8 1.5 0.9 0.7 1.1
 B2 (mg) 1.1 0.8 1.5 1.5 1.1 1.8 1.2 1.0 1.3
 B3 (mg) 10.0 6.8 12.9 14.1 9.5 17.9 10.2 8.7 11.5
 DFE (μg) 260 161 333 374 296 515 259 213 298
 B12 (μg) 2.6 1.4 3.4 3.3 2.3 4.0 2.7 2.1 3.1
 C (mg) 78.5 40.5 110 113 64.0 145 71.4 59.7 86.4
 E (mg) 4.2 2.6 8.5 7.7 5.7 9.5 4.8 4.3 5.2
Minerals
 Ca (mg) 682 455 863 927 689 1312 667 506 795
 Fe (mg) 8.0 5.5 10.8 11.6 7.8 15.4 7.6 5.9 9.3
 I (μg) 126 104 165 159 125 210 131 123 143
 K (mg) 1349 1025 1804 1891 1547 2363 1450 1284 1633
 Mg (mg) 150 115 186 219 180 275 142 116 157
 P (mg) 747 549 1006 1026 762 1273 692 564 780
 Na (mg) 936 480 1235 961 733 1279 777 667 949
 Zn (mg) 6.1 4.5 7.5 8.5 6.2 10.9 5.9 5.1 6.6
  1. aDifferences between medians assessed by the Wilcoxon signed rank test
  2. bBefore calibration, all median differences except for vitamin A were statistically significant (p < 0.001)
  3. cWFR and calibrated sqFFQ median was significantly different for vitamin A (p = 0.04)