Validity and reproducibility of an interviewer-administered food frequency questionnaire for healthy French-Canadian men and women

Table 4 Mean values of daily intakes of nutrients from two FFQ^a and Spearman correlation coefficients between values derived from the two FFQs^a.

	FFQ1	FFQ2	Difference (%)^c	Unadjusted^d	Energy-adjusted^d
Energy (kcal)	2283 ± 584	2128 ± 480	-6.8	0.73***
Protein (g) ^b	89.4 ± 28.4	86.8 ± 24.4	-2.9	0.65***	0.83***
CHO (g)	286.3 ± 88.2	262.2 ± 80.6	-8.4	0.79***	0.66***
Lipids (g) ^b	84.6 ± 25.1	78.9 ± 19.8	-6.7	0.47*	0.82***
SFA (g) ^b	28.8 ± 10.1	27.1 ± 8.6	-5.9	0.51*	0.81***
MUFA (g) ^b	34.9 ± 11.0	32.6 ± 8.4	-6.6	0.52*	0.82***
PUFA (g) ^b	14.3 ± 6.2	13.1 ± 4.7	-8.4	0.60**	0.74***
EPA (g) ^b	0.06 ± 0.05	0.07 ± 0.06	16.7	0.55**	0.55**
DHA (g) ^b	0.12 ± 0.09	0.15 ± 0.12	25.0	0.55**	0.56**
Trans fat (g)	3.5 ± 1.7	3.2 ± 1.4	-8.6	0.60**	0.79***
Cholesterol (mg)	278.2 ± 102.8	269.3 ± 75.1	-3.2	0.47*	0.73***
Dietary fiber (g)	22.9 ± 7.9	20.8 ± 6.3	-9.2	0.76***	0.75***
Soluble fiber (g)	7.8 ± 2.4	7.1 ± 2.0	-9.0	0.82***	0.87***
Insoluble fiber (g)	15.0 ± 5.5	13.7 ± 4.4	-8.7	0.73***	0.81***
Alchool (g)	9.6 ± 6.7	9.4 ± 8.0	-2.1	0.76***	0.70***
Vitamin C (mg)	201.6 ± 103.5	165.2 ± 77.0	-18.1	0.81***	0.62***
Folate (mcg) ^b	442.0 ± 147.4	394.5 ± 128.5	-10.7	0.71***	0.69***
Calcium (mg) ^b	1153.5 ± 453.5	1085.1 ± 456.2	-5.9	0.79***	0.86***
Iron (mg) ^b	15.8 ± 5.7	14.5 ± 4.7	-8.2	0.64***	0.79***

Values are means ± SD
^a 2 FFQ were administered 4 weeks apart
^b Student t test analyses were performed on log transformed values
^c (value derived from FFQ2 - value derived from FFQ1)/(value derived from FFQ1) × 100
^d Correlations between FFQ1 and FFQ2 were statistically significant at * p ≤ 0.05; ** p ≤ 0.01; *** p ≤ 0.0001

ISSN: 1475-2891