Table 7.
Association between diet group and intake of dietary fibre and risk of diverticular disease stratified by age
| All participants | Aged <60 | Aged ≥60 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cases | Relative risk (95% CI)* | P value | Cases | Relative risk (95% CI)* | P value | Cases | Relative risk (95% CI)* | P value | |||
| Diet group (P=0.069 for interaction†): | |||||||||||
| Meat eater | 633 | 1.00 | 0.003‡ | 291 | 1.00 | 0.286‡ | 342 | 1.00 | 0.001‡ | ||
| Fish eater | 77 | 0.91 (0.71 to 1.16) | 35 | 0.81 (0.56 to 1.17) | 42 | 1.02 (0.73 to 1.42) | |||||
| Vegetarian or vegan | 102 | 0.69 (0.55 to 0.86) | 67 | 0.82 (0.61 to 1.10) | 35 | 0.53 (0.37 to 0.76) | |||||
| Englyst fibre intake (g/day) (P=0.366 for interaction†)§: | |||||||||||
| 1 (lowest fifth) | 184 | 1.00 | <0.001¶ | 105 | 1.00 | 0.004¶ | 79 | 1.00 | 0.006¶ | ||
| 2 | 177 | 0.86 (0.69 to 1.06) | 97 | 0.97 (0.73 to 1.29) | 80 | 0.75 (0.54 to 1.04) | |||||
| 3 | 164 | 0.76 (0.61 to 0.96) | 69 | 0.71 (0.52 to 0.98) | 95 | 0.81 (0.59 to 1.13) | |||||
| 4 | 160 | 0.72 (0.57 to 0.92) | 72 | 0.80 (0.57 to 1.11) | 88 | 0.67 (0.48 to 0.94) | |||||
| 5 (highest fifth) | 127 | 0.59 (0.46 to 0.78) | 50 | 0.59 (0.40 to 0.87) | 77 | 0.58 (0.40 to 0.85) | |||||
*Stratified by sex, method of recruitment, and region of residence and adjusted for smoking, education level, Townsend deprivation index, hyperlipidaemia, receiving long term medical treatment, ever used oral contraceptives, ever used hormone replacement therapy, and BMI, where appropriate and using separate models for each subset.
†Tests of interaction performed with data for all participants by adding a diet group or fifths of dietary fibre intake × age group interaction to model as appropriate.
‡χ2 test.
§Further adjusted for sex specific fifths of energy intake.
¶P for trend obtained by replacing fifths of dietary fibre with a continuous variable equal to sex specific median in each fifth.