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Table 1 Selected baseline characteristics by categories of psychotic-like symptoms, of 33 623 participants with questionnaire data in the women's lifestyle and health study

From: Dietary intake of fish, omega-3, omega-6 polyunsaturated fatty acids and vitamin D and the prevalence of psychotic-like symptoms in a cohort of 33 000 women from the general population

  Positive psychotic-like symptomsa
  Low level group Middle level group High level group
  N = 18 411 N = 14 395 N = 817
Characteristics (55%) (43%) (2.4%)
Age b, years, mean (SD) 52 (6) 51 (6) 50 (6)
BMI, kg/m2, mean (SD) 23 (3.4) 23 (3.8) 24 (4.0)
BMI, kg/m 2 , No. (%)
< 25 normal weight 13 381 (73) 10 030 (70) 506 (62)
25-29.9 overweight 3 697 (20) 3005 (21) 198 (24)
≥ 30 obese 770 (4) 857 (6) 71 (9)
missing 563 (3) 503 (3) 42 (5)
Education, No. (%)
0-10 years 4 853 (26) 3 829 (27) 235 (29)
11-13 years 6 899 (37) 5 845 (41) 336 (41)
over 13 years 6 342 (34) 4 463 (31) 227 (28)
missing 317 (2) 258 (2) 19 (2)
Country of birth, No. (%)
northern countries 18 060 (98) 13 942 (97) 744 (91)
other countries 318 (2) 427 (3) 68 (8)
missing 33 (0.2) 26 (0.2) 5 (0.6)
Smokers, No. (%)
never 8 111 (44) 5 702 (40) 281 (35)
ever 10 250 (56) 8 656 (60) 534 (65)
missing 50 (0.3) 37 (0.3) 2 (0.2)
Alcohol intake, No. (%)
ever 16 258 (88) 12 614 (88) 668 (82)
never 2 153 (12) 1 781 (12) 149 (18)
Dietary intake, g/day, median (5-95%) of:
fatty fish 7 (0-21) 7 (0-21) 7 (0-28)
meat 76 (26-144) 78 (22-149) 77 (3-167)
dairy products 330 (20-831) 331 (14-850) 320 (4-857)
vegetables 79 (22-177) 79 (21-186) 80 (19-214)
fruit 107 (15-315) 106 (11-311) 102 (7-337)
cereals 125 (47-280) 129 (47-288) 129 (41-299)
saccharides (sugar) 20 (7-44) 20 (7-45) 21 (6-51)
alcohol 2.5 (0-11) 2.4 (0-11) 1.8 (0-12)
marine fatty acidsc 0.27 (0.07-0.6) 0.27 (0.06-0.6) 0.26 (0.05-0.7)
omega-3 fatty acidsd 1.3 (0.6-2) 1.3 (0.6-2) 1.2 (0.6-2)
omega-6 fatty acidse 4.8 (2-8) 4.8 (2-8) 4.7 (2-8)
vitamin D (μg/day) 4.0 (1.8-7.1) 3.9 (1.7-7.2) 3.8 (1.4-7.1)
Total energy intake, kJ/day, mean (SD) 6 509 (1 801) 6 626 (1 886) 6 637 (1 986)
Proportion of total energy intake, % from:
   • fat 31 31 31
   • protein 16 16 16
   • carbohydrate 51 51 51
   • alcohol 1 1 1
  1. a Participants categorized into levels of psychotic-like symptoms; low, middle, high (see methods section)
  2. b Age at the completeness of the follow-up questionnaire
  3. c Sum of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and docosapentaenoic acid
  4. d Sum of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), docosapentaenoic acid and α-linolenic acid
  5. e Sum of arachidonic and linoleic acids