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Table 4 Mean values of daily intakes of nutrients from two FFQa and Spearman correlation coefficients between values derived from the two FFQsa.

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

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