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Table 1 Distribution of fatty acid groups and ratios Q1, M, N, Q2 and Q3 : Mean ± SD; ARIC (1987–1995)1

From: Measurement error adjustment in essential fatty acid intake from a food frequency questionnaire: alternative approaches and methods

  Q1 M N Q2 Q3
  (n = 7,814) (n = 2,251) (n = 634)
Fatty acid groups and ratios j 2      
   6p 4.43 ± 1.43 55.22 ± 4.46 22.03 ± 2.59 4.29 ± 1.40 4.19 ± 1.36
   3p 0.41 ± 0.09 0.41 ± 0.10 0.14 ± 0.05 0.40 ± 0.09 0.41 ± 0.10
   6H 0.08 ± 0.03 9.11 ± 1.70 15.80 ± 2.10 0.07 ± 0.03 0.07 ± 0.03
   3H 0.18 ± 0.16 1.01 ± 0.39 3.44 ± 1.05 0.17 ± 0.15 0.16 ± 0.15
   6 4.50 ± 1.43 63.31 ± 4.01 37.73 ± 1.78 4.37 ± 1.41 4.27 ± 1.36
   3 0.60 ± 0.19 1.42 ± 0.43 3.59 ± 1.05 0.57 ± 0.18 0.57 ± 0.18
   3p/6p 0.10 ± 0.04 0.01 ± 0.00 0.01 ± 0.00 0.10 ± 0.02 0.11 ± 0.05
   3H/6H 2.27 ± 1.87 0.11 ± 0.05 0.22 ± 0.08 2.22 ± 1.71 2.12 ± 1.69
   3/6 0.15 ± 0.07 0.02 ± 0.01 0.09 ± 0.03 0.14 ± 0.07 0.15 ± 0.07
  1. 1 Q1: Food frequency questionnaire measurement at visit 1 of fatty acid group intake as % of energy intake or ratio of n-3 to n-6 groups. M: biomarker of fatty acid intake in cholesteryl ester fraction of plasma; N: biomarker of fatty acid intake in phospholipid fraction of plasma; Q2: Repeat of Q1 measured at visit 2 among a subset of the cohort; Q3: Repeat of Q1 measured at visit 3 among the surviving baseline cohort. 2 (3P) n-3 C18 polyunsaturated fatty acids: 18:3+18:4n-3 (6P) n-6 C18 polyunsaturated fatty acids: 18:2+18:3n-6 (3H) n-3 C20 and C22 highly unsaturated fatty acids (HUFAs): 20:5+22:5+22:6n-3 and (6H) n-6 HUFAs: 20:3+20:4+22:4+22:5n-6. Sums of fatty acid intake as percent of energy included (3) = (3P)+(3H) and (6) = (6P)+(6H). Ratios of interest: 3P/6P, 3H/6H and (3P+3H)/(6P+6H) also denoted as 3/6. Notation: The chemical structure of each fatty acid is as follows: "Total number of carbon atoms" : "# of double bonds" n-"carbon number with first double bond starting from the methyl end.