Table 4

Ethnicity-stratified logistic estimates of high-risk adenomatous polyps according to total, soluble and insoluble dietary fibre quartiles (n=2194)

PolypsEthnicitypinteraction
White (n=1920)Non-white (n=274)
ControlsCasesAdjusted*
OR (95% CI)
ControlsCasesAdjusted*
OR (95% CI)
Total fibre†
 Q12721941.0 (ref.)48341.0 (ref.)0.03
 Q22931930.92 (0.70 to1.22)37220.67 (0.31 to1.44)
 Q32861990.97 (0.72 to1.31)48160.35 (0.15 to0.80)
 Q42971860.88 (0.61 to1.25)50190.33 (0.12 to0.89)
Ptrend=0.57Ptrend=0.01
Soluble fibre‡
 Q12691991.0 (ref.)45341.0 (ref.)0.05
 Q23011900.82 (0.62 to1.08)40200.45 (0.20 to0.97)
 Q32732030.91 (0.68 to1.23)48210.40 (0.18 to0.90)
 Q43051800.70 (0.48 to1.01)50160.25 (0.09 to0.71)
Ptrend=0.13Ptrend=0.01
Insoluble fibre§
 Q12711941.0 (ref.)49331.0 (ref.)0.01
 Q22931870.91 (0.69 to1.21)40250.78 (0.37 to1.63)
 Q32842041.05 (0.78 to1.41)43170.41 (0.17 to0.94)
 Q43001870.88 (0.62 to1.25)51160.28 (0.11 to0.76)
Ptrend=0.73Ptrend<0.01
  • *Multivariate models adjusted for age, sex, BMI, total daily caloric intake, smoking status (never, former and current), reason for colonoscopy (average risk, FOBT/FIT+ and family history) and family history of polyps (yes versus no).

  • †Quartile cut-offs for total dietary fibre intake were: ≤14.3, 14.31–19.14, 19.15–25.51 and ≥25.52 g/day.

  • ‡Quartile cut-offs for dietary soluble fibre intake were: ≤4.83, 4.84–6.42, 6.43–8.44 and ≥8.45 g/day.

  • §Quartile cut-offs for dietary insoluble fibre intake were: ≤9.36, 9.37–12.72, 12.73–16.96 and ≥16.98 g/day.

  • Ref., reference group.