Table 2. Characteristics of cases and controls.
| Controls (n = 292) | Cases (n = 73) | |
|---|---|---|
| Age at recruitment (years, median and range) | 50.2 (29.1–75.8) | 50.5 (29.4–75.8) |
| Gender (% female) | 64% | 64% |
| Age at diagnosis (years, median and range) | – | 56.4 (24.0–78.7) |
| Time between recruitment & diagnosis (years, median and range) | – | 5.3 (1.5–14.3) |
| Distribution of disease (n, %) | ||
| L1, ileal | 21 (29%) | |
| L2, colonic | 31 (42%) | |
| L3, ileocolonic | 14 (19%) | |
| L4, isolated upper GI disease | 2 (3%) | |
| Current smoker | 27% | 40%a |
| Total energy intake (kJ/day, median and range) | 8486 (3684–19 722) | 8711 (4509–18 056) |
| Body mass index (kg/m2) (mean, s.d.) | 25.1 (3.7) | 25.1 (4.0) |
| Median daily intakes (g/day, range) | ||
| Docosahexaenoic acid | 0.13 (0.01–1.49) | 0.14 (0.02–0.97) |
| Eicosapentaenoic acid | 0.07 (0.01–0.82) | 0.06 (0.01–0.63) |
| α‐linolenic acid | 1.30 (0.40–4.51) | 1.33 (0.68–5.14) |
| Linoleic acid | 10.33 (3.12–39.71) | 10.60 (4.08–44.19) |
| Oleic acid | 21.01 (6.05–76.75) | 22.55 (10.18–62.28) |
Cases were more likely than controls to be smokers.
a
P < 0.05.