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Table 1 Characteristics of the subjects according to tertile of n-3 PUFA and n-6 PUFA in serum cholesterol ester

From: Polyunsaturated fatty acids in serum and homocysteine concentrations in Japanese men and women: a cross-sectional study

   n-3 PUFA    n-6 PUFA   
  T1 (2.74)1 T2 (4.01) T3 (5.79) P-trend2 T1 (58.36) T2 (62.58) T3 (66.18) P-trend
No. of subjects 166 165 165   166 165 165  
Age (y, mean ± SD) 37.9 ± 9.3 41.8 ± 10.5 47.7 ± 9.8 <0.001 47.9 ± 10.1 41.4 ± 10.4 38.1 ± 8.9 <0.001
Sex (male,%) 52.4 54.6 68.5 <0.001 79.5 57.0 38.8 <0.001
Workplace (A,%)3 31.3 31.5 29.7 0.75 29.5 31.5 31.5 0.69
Body Mass Index (kg/m2, mean ± SD) 21.9 ± 3.3 22.5 ± 3.9 23.0 ± 3.2 0.01 23.5 ± 3.5 22.3 ± 3.5 21.6 ± 3.2 <0.001
Current smoking (%) 21.1 28.5 32.7 0.02 43.4 26.1 12.7 <0.001
Alcohol consumption (≥20 g of ethanol/d,%) 28.9 40.0 58.2 <0.001 64.5 35.2 27.3 <0.001
Occupational physical activity (sedentary,%) 80.1 77.6 83.6 0.12 81.9 84.2 75.2 0.42
Non-occupational physical activity (≥5 MET-h/wk,%) 27.7 29.7 30.3 0.60 36.8 30.3 20.6 0.001
Serum folate (ng/ml) 3.4 (2.6, 4.9)4 3.8 (2.7, 5.0) 4.3 (3.1, 5.8) 0.002 3.4 (2.7, 4.7) 3.8 (2.7, 5.7) 4.0 (3.0, 5.3) 0.005
Dietary intake of vitamin B6         
(mg/1000 kcal, mean ± SD) 0.6 ± 0.2 0.7 ± 0.2 0.7 ± 0.1 0.18 0.6 ± 0.2 0.7 ± 0.2 0.7 ± 0.1 0.28
Dietary intake of vitamin B12 (μg/1000 kcal) 3.9 (2.8, 5.0) 4.1 (3.1, 5.2) 5.1 (4.0, 6.2) <0.001 4.8 (3.6, 6.1) 4.3 (3.0, 5.9) 4.0 (3.0, 5.0) <0.001
  1. Abbreviations: T Tertile, PUFA Polyunsaturated fatty acids, SD Standard deviation, MET Metabolic equivalent.
  2. 1Median percentage of n-3 PUFA or n-6 PUFA (all such values).
  3. 2P-trend values were based on the Mantel-Haenszel chi-square test for categorical variables and on linear regression analysis for continuous variables,with ordinal numbers 0–2 assigned to tertile categories of each fatty acid.
  4. 3A, workplace surveyed in July.
  5. 4Median (interquartile range) of serum folate and dietary intake of vitamin B12.