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Table 4 Baseline characteristics for subgroups (data on Q1, additional data on biomarkers M/N, and on replicates Q2 and Q3); ARIC, 1987

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

  Q1 (n = 7,814) Q1, M and N (n = 2,251) Q1, Q2 and Q3 (n = 634)
  n % n % n %
White 6,387 81.5 2,251 100* 501 79.0
Female 4,269 54.6 1,141 50.7* 293 46.2*
Age(years)       
   50–54 2,904 37.2 896 39.8* 179 28.2*
   55–59 2,619 33.5 743 33.0 247 38.9
   60+ 2,291 29.3 612 27.2 208 32.8
Education       
   Less than High school 1,580 20.2 150 6.7* 141 22.3
   High school graduate 2,658 34.1 814 36.2 189 29.9
   More than High school 3,567 45.7 1,286 57.2 303 47.9
Apo E ε4 allele 2,249 30.0 614 28.8 164 27.0
Body Mass Index (kg per m2)       
   <25.00 2,596 33.2 760 33.8* 220 34.7
   25.0–29.9 3,220 41.2 962 42.8 274 43.2
   ≥ 30 1,995 25.5 528 23.5 140 22.1
Smoking status       
   Current smoker 1,555 19.9 400 17.8* 136 21.4
   Former smoker 2,776 35.5 941 41.8 227 35.8
   Never smoked 3,478 44.5 909 40.4 271 42.7
  Mean (SD) Mean (SD) Mean (SD)
Alcohol (g/d) 5.9 (12.7) 8.1 (13.5)* 5.6 (11.2)
Caffeine (mg/day) 291.04 (290.82) 348.08 (325.93)* 313.36 (297.42)*
Physical activity scale 7.06 (1.39) 7.33 (1.33)* 7.10 (1.48)
Energy intake (kcal/day) 1578 (571) 1581 (559) 1620 (566)
Vitamin A (1000 IUs/day) 9.1 (7.0) 8.6 (6.8)* 9.2 (7.3)
Vitamin B6 (mg/day) 1.75 (0.67) 1.74 (0.66) 1.75 (0.68)
Vitamin B12 (mcg/day) 7.61 (4.23) 7.06 (3.50)* 7.97 (4.32)*
Vitamin C (mg/day) 122 (81) 113 (70)* 122 (86)
Vitamin E (mg/day) 5.0 (3.1) 4.7 (3.0)* 5.1 (3.4)
Folate (mcg/day) 232.59 (101.18) 218.48 (94.97)* 235.03 (102.66)
  1. *p < 0.05 for hypothesis that the distribution of the categorical variables is independent of the group or that mean in (Q1) group is equal to mean in each of the other group for continuous variables.