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Table 5 Validity coefficients (95 % confidence intervals) for the Riksmaten method, MiniMeal-Q and total plasma carotenoids and total plasma alkylresorcinols for women and men

From: Carotenoids and alkylresorcinols as objective biomarkers of diet quality when assessing the validity of a web-based food record tool and a food frequency questionnaire in a middle-aged population

  Carotenoids Alkylresorcinols
ρ (95 % CI) Women Men Women + men Women Men Women + men
ρRT 0.78 (0.58, 0.97) 0.66 (−0.32, 1a) 0.80 (0.63, 0,98) 0.66 (−1a, 1a) 0.73 (−1a, 1a) 0.69 (−1a, 0.97)
ρMT 0.62 (0.40, 0.79) 0.94 (−1a, 1a) 0.69 (0.53, 0.72) 0.75 (−0.16, 1a) 0.60 (−0.12, 1a) 0.68 (0.29, 1a)
ρBT 0.55 (0.29, 0.73) 0.24 (−0.01, 0.22) 0.44 (0.28, 0.58) 0.31 (−0.01, 0.38) 0.33 (−0.01, 0.39) 0.30 (0.03, 0.53)
  1. Abbreviations: ρ validity coefficient, ρRT validity coefficient for the Riksmaten method, ρMT validity coefficient for MiniMeal-Q, ρBT validity coefficient for biomarker, T theoretical true intake
  2. aThe maximum limits were set to either −1 or +1