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Table 5 Coefficients for the calibration of the sqFFQ, as determined by multivariable linear regression analysis

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

  Constanta sqFFQb Agec Sexc Adjusted R2
 Total energy (kJ) 2992.629 0.195 58.556 − 675.849 0.306
 protein (g) 13.336 0.252 0.739   0.171
 total fat (g) 29.570 0.160 0.390 −5.430 0.150
 SFA (g) 12.111 0.182    0.043
 MUFA (g)d 2.508 0.007   −0.137 0.063
 PUFA(g)d 1.871 0.030   −0.157 0.192
 DHA (g)d 0.292 0.031 0.006   0.198
 total CHO (g) 91.260 0.190 1.930 −26.010 0.260
 sugars (g)d 3.952 0.005   −0.288 0.225
 fibre (g)d 1.713 0.033   −0.142 0.313
Vitamins
 A (μg)d 10.510 0.001 −0.053 −0.822 0.144
 B1 (mg)d 0.777 0.158    
 B2 (mg) 0.507 0.457    0.264
 B3 (mg) 5.599 0.330    0.156
 DFE (μg) 181.225 0.223 3.732 −69.446 0.221
 B12 (μg) 0.726 0.583    0.268
 C (mg)d 4.157 0.016   −0.486 0.256
 E (mg)d 1.464 0.029    0.040
Minerals
 Ca (mg)d 7.722 0.002   −0.659 0.388
 Fe (mg)d 1.783 0.034   −0.150 0.331
 I (μg)d 4.602 0.003    0.074
 K (mg) 394.551 0.326 19.487   0.202
 Mg (mg)d 4.397 0.003 0.025 −0.333 0.278
 P (mg)d 7.453 0.001 0.047 −0.536 0.285
 Na (mg)d 7.270 0.002    0.212
 Zn (mg)d 1.802 0.024   −0.141 0.193
  1. aConstant statistically significant (p < 0.05) for all nutrients except protein
  2. bsqFFQ statistically significant (p < 0.05) for all nutrients except MUFA
  3. cAge and/or sex were only included in model if p < 0.10; Sex coded 1 for male and 2 for female
  4. dThe cube root of the WFR value was used for this nutrient. When the coefficients for this nutrient are used in the linear equation to calibrate sqFFQ values, the final value must be cubed to back-transform