Table 3.

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

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 §§

Spearmans correlations undertaken in unadjusted (crude) data. Pearsons correlations undertaken on all other data (square-root transformed).

* denotes p-value < 0.05; ** denotes p-value < 0.01; § denotes median; §§ denotes mean.