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Table 4 Diagonal proportions in cross-classification of nutrient distribution and estimated kappa values and 95% confidence intervals for dietary intake of DHA, from fish intake, FFQs and plasma measurements in the study participants, categorized by quintile distribution

From: A Taiwanese food frequency questionnaire correlates with plasma docosahexaenoic acid but not with plasma eicosapentaenoic acid levels: questionnaires and plasma biomarkers

   Diagonal proportion % Kappa SE 95% Conf limit
Total fish intake C22:6 50.2 0.63 0.03 0.58 0.68
Total fish intake DHA 26.9 0.18 0.04 0.10 0.26
C22:6 DHA 25.9 0.20 0.04 0.12 0.28