Table 2.

Correlation coefficients for nutrient intakes from the vegan food frequency questionnaires (FFQ) and three 24-h diet recalls.

Nutrients	Non-Adjusted Correlations ab	p-Values	Kcal-Adjusted Correlations ac	p-Values	Standardized Correlations d	p-Values
Protein (g)	0.365	<0.001	0.374	<0.001	0.291	0.003
n-3 FA (g)	0.501	<0.001	0.600	<0.001	0.468	<0.001
Calcium (mg)	0.128	0.206	0.191	0.057	−0.031	0.758
Iron (mg)	0.371	<0.001	0.449	<0.001	0.296	0.003
Zinc (mg)	0.399	<0.001	0.506	<0.001	0.332	0.001
Vitamin D (µg)	0.391	0.001	0.464	<0.001	0.305	0.002
Vitamin B12(µg)	0.335	0.001	0.403	<0.001	0.339	0.001

n = 100; ^a Nutrient intakes have been log-transformed using log_e to improve normality; ^b Pearson r correlations for nutrient values unadjusted for energy; ^c Pearson r correlations for energy-adjusted nutrients using the residual regression method; ^d Standardized (z score) correlation coefficients of crude nutrient intakes between methods.