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. 2010 Oct 11;172(11):1315–1323. doi: 10.1093/aje/kwq284

Table 3.

Intraclass Correlation Coefficients for Correlation Among 3 Days of Recorded Dietary Intake Between Undocumented and Documented Food Records in Participant Subgroups Receiving Minimal and Comprehensive Instruction, Pathways Study, Northern California, 2006–2009

Daily Nutrient Intake Minimal Instruction Group (n = 130)
 Comprehensive Instruction Group (n = 70)
Undocumenteda
 Documentedb
 Undocumenteda
 Documentedb
ICC 95% CI ICC 95% CI ICC 95% CI ICC 95% CI
Energy, kcal 0.46 0.36, 0.56 0.46 0.35, 0.56 0.69 0.59, 0.79 0.69 0.59, 0.79
Alcohol, g 0.71 0.63, 0.78 0.62 0.53, 0.70 0.72 0.63, 0.82 0.64 0.53, 0.75
    % of energy from alcohol 0.65 0.57, 0.73 0.58 0.48, 0.67 0.76 0.68, 0.85 0.63 0.51, 0.74
Fat, g 0.34 0.23, 0.45 0.32 0.21, 0.43 0.59 0.47, 0.71 0.61 0.49, 0.72
    % of energy from fat 0.28 0.17, 0.39 0.26 0.15, 0.37 0.38 0.24, 0.53 0.40 0.25, 0.54
Carbohydrate, g 0.54 0.44, 0.63 0.46 0.35, 0.56 0.67 0.56, 0.77 0.67 0.57, 0.78
    % of energy from carbohydrate 0.32 0.21, 0.43 0.33 0.22, 0.44 0.43 0.28, 0.57 0.41 0.26, 0.55
Protein, g 0.37 0.26, 0.48 0.45 0.34, 0.55 0.49 0.35, 0.63 0.56 0.43, 0.68
    % of energy from protein 0.32 0.21, 0.43 0.32 0.21, 0.43 0.39 0.24, 0.54 0.43 0.29, 0.58
Saturated fatty acids, g 0.36 0.25, 0.47 0.29 0.18, 0.40 0.59 0.47, 0.71 0.63 0.52, 0.74
Monounsaturated fatty acids, g 0.32 0.20, 0.43 0.31 0.20, 0.42 0.57 0.45, 0.70 0.57 0.44, 0.69
Polyunsaturated fatty acids, g 0.27 0.16, 0.38 0.31 0.20, 0.42 0.48 0.34, 0.62 0.51 0.37, 0.64
Trans-fatty acids, g 0.33 0.22, 0.44 0.25 0.14, 0.36 0.46 0.32, 0.60 0.57 0.45, 0.70
Fiber, g 0.55 0.45, 0.64 0.55 0.45, 0.64 0.64 0.53, 0.75 0.69 0.58, 0.79
Beta-carotene, μg 0.34 0.23, 0.45 0.33 0.22, 0.45 0.37 0.23, 0.52 0.38 0.24, 0.53
Vitamin D, μg 0.24 0.12, 0.35 0.33 0.21, 0.44 0.49 0.35, 0.63 0.52 0.39, 0.66
Vitamin C, mg 0.53 0.43, 0.62 0.49 0.39, 0.59 0.54 0.41, 0.67 0.54 0.41, 0.67
Vitamin E, mg 0.43 0.33, 0.54 0.39 0.28, 0.50 0.61 0.50, 0.73 0.59 0.47, 0.71
Calcium, mg 0.47 0.37, 0.57 0.50 0.40, 0.60 0.59 0.46, 0.71 0.55 0.42, 0.68
Folate, DFE 0.32 0.21, 0.43 0.38 0.27, 0.49 0.58 0.45, 0.70 0.54 0.41, 0.67
Lycopene, μg 0.25 0.14, 0.36 0.06 −0.05, 0.16 0.20 0.04, 0.35 0.23 0.08, 0.38
Glycemic loadc 0.51 0.41, 0.60 0.42 0.31, 0.52 0.64 0.53, 0.75 0.66 0.55, 0.77
Omega-3 fatty acids, gd 0.01 −0.09, 0.11 0.16 0.05, 0.27 0.41 0.27, 0.56 0.46 0.32, 0.60

Abbreviations: CI, confidence interval; DFE, dietary folate equivalents; ICC, intraclass correlation coefficient.

a

Undocumented ICCs by nutrient were significantly different from the other group using Fisher's z transformation (all P’s < 0.05 except for alcohol, vitamin C, beta-carotene, total grams, and lycopene (P’s > 0.05)).

b

Documented ICCs by nutrient were significantly different from the other group using Fisher's z transformation (all P’s < 0.01 except for percentage of energy from alcohol, vitamin C, beta-carotene, total grams, and lycopene (P’s > 0.05)).

c

Glycemic load (14) was calculated using bread as the reference value.

d

Omega-3 fatty acids consist of docosahexaenoic acid plus eicosapentaenoic acid.