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

Table 4 Correlation coefficients for the ACAES FFQ1 and ACAES FFQ2 for reproducibility

Energy & Nutrients	FFQ1 vs FFQ2 (n = 101)
	Unadjusted (crude)	Transformed	Energy-adjusted, transformed
Energy (kJ)	0.45 **	0.44 **	-
Protein (g)	0.50 **	0.48 **	0.36 **
Fat (g)	0.49 **	0.50 **	0.31 **
Sat Fat (g)	0.48 **	0.49 **	0.35 **
Poly Fat (g)	0.44 **	0.44 **	0.33 **
Mono Fat (g)	0.50 **	0.51 **	0.33 **
Carbohydrate (g)	0.37 **	0.35 **	0.20*
Sugars (g)	0.34 **	0.34 **	0.31 **
Fibre (g)	0.44 **	0.40 **	0.31 **
Thiamin (mg)	0.40 **	0.37 **	0.21*
Riboflavin (mg)	0.46 **	0.43 **	0.21*
Niacin (mg)	0.52 **	0.50 **	0.36 **
Niacin equiv (mg)	0.53 **	0.51 **	0.41 **
Vitamin C (mg)	0.45 **	0.38 **	0.34 **
Folate (μg)	0.45 **	0.41 **	0.28 **
Vitamin A (μg)	0.42 **	0.37 **	0.18
Retinol (μg)	0.46 **	0.36 **	0.20
Betacarotene (μg)	0.50 **	0.48 **	0.45 **
Magnesium (mg)	0.46 **	0.44 **	0.49 **
Calcium (mg)	0.46 **	0.48 **	0.50 **
Iron (mg)	0.45 **	0.41 **	0.29 **
Zinc (mg)	0.49 **	0.49 **	0.40 **
Measure of central tendency	0.46 §	0.44 §§	0.32 §§

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.

ISSN: 1479-5868