Table 6 |
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|
Intraclass correlation coefficients for food frequency questionnaires completed at the beginning and end of 12 months† |
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|
FFQ 1 vs. FFQ 2 |
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|
Unadjusted r (CI) |
Energy adjusted r (CI) |
|
|
|
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|
Total Energy (kcal) |
0.87 (0.78, 0.92) |
|
|
Total Carbohydrate |
0.85 (0.76, 0.91) |
0.76 (0.61, 0.85) |
|
Protein |
0.83 (0.73, 0.90) |
0.79 (0.66, 0.87) |
|
Total Fat |
0.85 (0.75, 0.90) |
0.74 (0.57, 0.84) |
|
Total Saturated Fat |
0.78 (0.65, 0.87) |
0.50 (0.18, 0.69) |
|
Total MUFA |
0.82 (0.71, 0.89) |
0.79 (0.66, 0.87) |
|
Total PUFA |
0.75 (0.60, 0.80) |
0.54 (0.24, 0.71) |
|
Linoleic acid |
0.75 (0.59, 0.85) |
0.68 (0.48, 0.80) |
|
Linolenic acid |
0.73 (0.55, 0.83) |
0.55 (0.26, 0.72) |
|
Cholesterol |
0.80 (0.67, 0.87) |
0.80 (0.67, 0.87) |
|
Calcium |
0.85 (0.75, 0.91) |
0.79 (0.66, 0.87) |
|
Iron |
0.90 (0.84, 0.94) |
0.68 (0.47, 0.80) |
|
Retinol |
0.73 (0.56, 0.83) |
0.74 (0.57, 0.84) |
|
Beta-carotene (ug) |
0.71 (0.53, 0.82) |
0.75 (0.59, 0.85) |
|
Vitamin E |
0.77 (0.56, 0.82) |
0.78 (0.58, 0.85) |
|
Folate |
0.88 (0.80, 0.92) |
0.77 (0.62, 0.86) |
|
Vitamin K |
0.72 (0.54, 0.83) |
0.72 (0.54, 0.83) |
|
Zinc |
0.79 (0.65, 0.87) |
0.79 (0.66, 0.87) |
|
Total dietary fiber |
0.82 (0.70, 0.90) |
0.84 (0.68, 0.90) |
|
Alcohol |
0.76 (0.45, 0.89) |
0.68 (0.27, 0.86) |
|
|
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|
a Energy-adjusted correlations between dietary methods as suggested by Willett (1) b All variables were log-transformed before analysis. |
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|
Jackson et al. Nutrition Journal 2011 10:28 doi:10.1186/1475-2891-10-28 |
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