Table 1

Baseline characteristics of study participants grouped by use of fish oil supplements

CharacteristicsAll participants
(n=415 737)
Non-users of supplements
(n=285 372)
Users of supplements
(n=130 365)
Age (years)
 <65346 524 (83.4)245 679 (86.1)100 845 (77.4)
 ≥6569 213 (16.6)39 693 (13.9)29 520 (22.6)
Sex
 Women228 758 (55.0)153 715 (53.9)75 043 (57.6)
 Men186 979 (45.0)131 657 (46.1)55 322 (42.4)
Ethnic group
 White392 851 (94.5)268 845 (94.2)124 006 (95.1)
 Non-white22 886 (5.5)16 527 (5.8)6359 (4.9)
Setting*
 Rural57 474 (14.0)38 731 (13.7)18 743 (14.5)
 Urban354 186 (86.0)243 654 (86.3)110 532 (85.5)
Body mass index*
 Underweight2149 (0.5)1565 (0.6)584 (0.4)
 Normal weight137 806 (33.3)92 895 (32.7)44 911 (34.6)
 Overweight176 041 (42.6)119 539 (42.1)56 502 (43.5)
 Obese97 774 (23.6)69 950 (24.6)27 824 (21.4)
Consumption of oily fish (times/week)
 <2343 096 (82.5)241 491 (84.6)101 605 (77.9)
 ≥272 641 (17.5)43 881 (15.4)28 760 (22.1)
Consumption of non-oily fish (times/week)
 <2348 253 (83.8)241 331 (84.6)106 922 (82.0)
 ≥267 484 (16.2)44 041 (15.4)23 443 (18.0)
Consumption of vegetables* (times/week)
 <228 365 (6.8)21 963 (7.7)6402 (4.9)
 2-3119 066 (28.7)84 866 (29.8)34 200 (26.3)
 ≥4267 926 (64.5)178 254 (62.5)89 672 (68.3)
Consumption of fruit* (times/week)
 <2115 111 (27.7)88 845 (31.2)26 266 (20.2)
 2-3169 869 (40.9)116 655 (40.9)53 214 (40.8)
 ≥4130 467 (31.4)79 657 (27.9)50 810 (39.0)
Consumption of red meat* (times/week)
 <261 945 (14.9)42 846 (15.0)19 099 (14.7)
 2-3183 952 (44.3)122 621 (43.0)61 331 (47.1)
 ≥4169 588 (40.8)119 712 (42.0)49 876 (38.9)
Smoking status
 Never233 367 (56.1)161 564 (56.6)71 803 (55.1)
 Ever139 168 (33.5)91 189 (32.0)47 979 (36.8)
 Current43 202 (10.4)32 619 (11.4)10 583 (8.1)
Consumption of alcohol
 Never17 911 (4.3)12 982 (4.5)4929 (3.8)
 Ever13 836 (3.3)9762 (3.4)4074 (3.1)
 Current383 990 (92.4)262 628 (92.0)121 362 (93.1)
Physical activity* (%)
 Low62 892 (18.5)46 526 (20.0)16 366 (15.4)
 Moderate138 203 (40.8)95 958 (41.2)42 245 (39.8)
 High137 878 (40.7)90 241 (38.8)47 637 (44.8)
Townsend deprivation index (mean, SD)−1.4 (3.1)−1.3 (3.0)−1.5 (3.0)
  • Data are number (%) unless stated otherwise.

  • *These variables included missing values.