Table 1 Descriptions of baseline characteristics for the overall participants and by dietary iron intake trajectory groups
Characteristics | Total (n = 61,115) | Iron intake trajectory group | |||
|---|---|---|---|---|---|
1 (n = 12,976) | 2 (n = 13,062) | 3 (n = 19,814) | 4 (n = 15,263) | ||
Age, mean (SD), y | 56.3 (7.7) | 55.5 (7.7) | 56.1 (7.7) | 56.7 (7.6) | 56.8 (7.7) |
Male, n (%) | 26,251 (43.0) | 4,066 (31.3) | 4,721 (36.1) | 8,678 (43.8) | 8,786 (57.6) |
White ethnicity, n (%) | 59,375 (97.2) | 12,390 (95.5) | 12,673 (97.0) | 19,378 (97.8) | 14,934 (97.8) |
Urban residence area, n (%) | 51,348 (84.0) | 11,020 (84.9) | 10,969 (84.0) | 16,604 (83.8) | 12,755 (83.6) |
Body mass index, mean (SD), kg/m2 | 26.3 (4.4) | 26.6 (4.7) | 26.5 (4.5) | 26.2 (4.3) | 26.1 (4.2) |
Physical activity, n (%) | |||||
 No MVPA | 6,281 (10.3) | 1,759 (13.6) | 1,332 (10.2) | 1,886 (9.5) | 1,304 (8.5) |
 Low PA | 14,518 (23.8) | 3,172 (24.4) | 3,183 (24.4) | 4,774 (24.1) | 3,389 (22.2) |
 Medium PA | 9,623 (15.7) | 1,887 (14.5) | 2,009 (15.4) | 3,258 (16.4) | 2,469 (16.2) |
 High PA | 22,313 (36.5) | 4,117 (31.7) | 4,577 (35.0) | 7,273 (36.7) | 6,346 (41.6) |
Smoking status, n (%) | |||||
 Current smoker | 3,827 (6.3) | 1,080 (8.3) | 847 (6.5) | 1,052 (5.3) | 848 (5.6) |
 Previous smoker | 21,490 (35.2) | 4,239 (32.7) | 4,537 (34.7) | 7,047 (35.6) | 5,667 (37.1) |
 Never | 35,690 (58.4) | 7,632 (58.8) | 7,651 (58.6) | 11,681 (59.0) | 8,726 (57.2) |
Alcohol drinking status, n (%) | |||||
 Current drinker | 57,606 (94.3) | 11,926 (91.9) | 12,305 (94.2) | 18,788 (94.8) | 14,587 (95.6) |
 Previous drinker | 1,688 (2.8) | 509 (3.9) | 352 (2.7) | 503 (2.5) | 324 (2.1) |
 Never | 1,789 (2.9) | 534 (4.1) | 397 (3.0) | 510 (2.6) | 348 (2.3) |
Income, n (%) | |||||
 < £ 18,000 | 7,570 (12.4) | 1,771 (13.6) | 1,648 (12.6) | 2,328 (11.7) | 1,823 (11.9) |
 £ 18,000 - £ 30,999 | 13,314 (21.8) | 2,813 (21.7) | 2,864 (21.9) | 4,294 (21.7) | 3,343 (21.9) |
 £ 31,000 - £ 51,999 | 16,105 (26.4) | 3,398 (26.2) | 3,440 (26.3) | 5,234 (26.4) | 4,033 (26.4) |
 £ 52,000 - £ 100,000 | 14,198 (23.2) | 2,810 (21.7) | 2,954 (22.6) | 4,729 (23.9) | 3,705 (24.3) |
 > £ 100,000 | 4,506 (7.4) | 858 (6.6) | 913 (7.0) | 1,508 (7.6) | 1,227 (8.0) |
TDI, mean (SD) | -1.7 (2.8) | -1.5 (2.9) | -1.7 (2.8) | -1.8 (2.8) | -1.7 (2.8) |
Use of iron supplements, n (%) | 2,087 (3.4) | 503 (3.9) | 424 (3.3) | 632 (3.2) | 528 (3.5) |
Saturated fat intake, mean (SD), g/day | 30.4 (14.9) | 25.2 (11.9) | 28.8 (26.8) | 31.2 (14.7) | 35.2 (16.9) |
Carbohydrate intake, mean (SD), g/day | 253.7 (95.5) | 198.0 (71.0) | 236.2 (77.8) | 261.7 (87.6) | 305.6 (106.9) |
Protein intake, mean (SD), g/day | 82.1 (27.8) | 66.6 (22.6) | 77.6 (23.7) | 84.2 (25.7) | 96.3 (30.0) |
Magnesium intake, mean (SD), mg/day | 350.3 (114.1) | 262.3 (75.1) | 322.7 (82.8) | 361.3 (96.2) | 434.6 (122.4) |
Fiber intake, mean (SD), g/day | 16.2 (6.8) | 11.7 (4.8) | 14.8 (5.3) | 16.8 (6.0) | 20.7 (7.3) |
Total energy, mean (SD), KJ/day | 8854.4 (2843.0) | 6945.9 (2047.2) | 8268.6 (2253.2) | 9121.0 (2545.5) | 10632.1 (3066.3) |
Glycated haemoglobin, mean (SD), % | 5.3 (2.5) | 5.3 (2.5) | 5.3 (2.5) | 5.3 (2.6) | 5.3 (2.5) |
Cardiovascular disease, n (%) | 6,374 (10.4) | 1,314 (10.1) | 1,301 (10.0) | 2,061 (10.4) | 1,698 (11.1) |
Hypercholesterolemia, n (%) | 8,263 (13.5) | 1,666 (12.8) | 1,774 (13.6) | 2,671 (13.5) | 2,152 (14.1) |
Hypertension, n (%) | 32,385 (53.0) | 6,664 (51.4%) | 6,857 (52.5) | 10,627 (53.6) | 8,237 (54.0) |