Table 1.

Relative risks comparing the top quantile versus the bottom quantile and 95% CIs from cohort studies and clinical trials examining the role of dietary fiber and colorectal neoplasia by type of fiber and disease type

Study authorFiber source (Relative risk comparing the top quantile vs the bottom quantile and 95% CI)
Total fiberCereal fiberVegetable fiberFruit fiberLegume fiberSoluble fiberInsoluble fiber
Bingham et al. (12)
    Colorectal cancer0.75 (0.59-0.95)0.78 (0.62-0.98)0.88 (0.70-1.11)0.78 (0.64-0.97)1.04 (0.84-1.30)
Peters et al. (13)
    Distal colorectal adenomas0.91 (0.86-0.97)0.88 (0.79-0.97)1.00 (0.89-1.15)0.80 (0.71-0.93)0.99 (0.78-1.20)
Mai et al. (8)
    Colorectal cancer0.94 (0.70-1.26)1.02 (0.76-1.37)0.92 (0.69-1.21)1.10 (0.83-1.46)0.84 (0.63-1.10)
Jacobs et al. (7)
    Recurrent colorectal adenomas0.83 (0.57-1.19)0.84 (0.59-1.19)1.34 (0.94-1.91)0.92 (0.64-1.32)
Terry et al. (5)
    Colorectal cancer0.96 (0.70-1.33)0.91 (0.69-1.20)1.17 (0.85-1.61)0.97 (0.69-1.38)
    Colon cancer0.84 (0.59-1.20)
    Proximal colon cancer0.77 (0.45-1.32)
    Distal colon cancer0.86 (0.47-1.60)
    Rectal cancer1.10 (0.69-1.76)
Fuchs et al. (4)
    Colorectal cancer0.95 (0.73-1.25)1.00 (0.79-1.27)1.35 (1.05-1.72)0.86 (0.67-1.10)
    Distal colorectal adenomas0.91 (0.71-1.16)0.92 (0.75-1.14)0.89 (0.71-1.12)0.85 (0.68-1.06)
Pietinen et al. (6)
    Colorectal cancer1.00 (0.6-1.5)1.00 (0.7-1.6)1.2 (0.8-1.9)1.10 (0.8-1.7)1.1 (0.7-1.6)1.0 (0.6-1.5)
Platz et al. (3)
    Distal colon adenomas 0.88 (0.59-1.31)1.20 (0.86-1.66)0.93 (0.67-1.30)0.81 (0.59-1.11)0.82 (0.60-1.11)0.69 (0.46-1.03)1.14 (0.77-1.69)