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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