Table 2. Stratified analysis of breast cancer risk in relation to dietary fibre intake according to study characteristics.

Group	No. of studies	RR (95% CI)	Pheterogeneity	I2(%)
Menopausal status
Premenopause	3	0.78 (0.62–0.94)	0.172	43.2
Postmenopause	10	0.88 (0.79–0.97)	0.027	52.1
Not specified	11	0.92 (0.84–0.99)	0.016	54.2
Jadad score
3	6	0.82(0.64–0.99)	0.014	65.1
4	10	0.96 (0.88, 1.03)	0.796	0
5	8	0.85 (0.77,0.93)	0	76.9
IF
>3	21	0.89 (0.83-0.94)	0.002	54.1
3	3	0.77 (0.48, 1.07)	0.002	83.8
Study types
Cohort	20	0.91 (0.87, 0.95)	0.210	19.6
Case-control	4	0.75 (0.47–1.02)	0.001	80.6
Geographic region
Developed countries	22	0.89 (0.84, 0.94)	0.004	50.4
Developing countries	2	0.71 (0.66–1.47)	0	91.8

IF, influence factor; No., Number; RR, relative risk; CI, confidence interval.