Table 3 Odds and 95% confidence interval for occurrence of the gallstone in each tertile categories of fiber intake

Total fiber

T1 (< 24.5)

T2 (24.5–35)

T3 (35 ≤)

No. of cases

77

45

58

Model 1

ref

0.63

(0.4–1)

0.49

(0.3–0.75)

0.091

Model 2

ref

0.73

(0.47–1.6)

0.45

(0.3–0.7)

0.007

Model 3

ref

0.65

(0.4–1.3)

0.44

(0.37–0.7)

0.015

Soluble fiber

T1 (< 0.37)

T2 (0.37–0.69)

T3 (0.69 ≤)

No. of cases

98

122

122

Model 1

ref

0.58

(0.4–0.9)

0.54

(0.2–0.7)

0.081

Model 2

ref

0.55

(0.3–0.9)

0.5

(0.3–0.8)

0.066

Model 3

ref

0.57

(0.3–0.9)

0.51

(0.3–0.8)

0.048

Insoluble fiber

T1 (< 2)

T2 (2–3.6)

T3 (3.6 ≤)

No. of cases

101

116

125

Model 1

ref

0.69

(0.4–1)

0.54

(0.3–0.9)

 < 0.001

Model 2

ref

0.75

(0.48–1.2)

0.53

(0.34–0.84)

 < 0.001

Model 3

ref

0.8

(0.4–1.3)

0.56

(0.3–0.9)

 < 0.001