Table 2 Prevalence of gallstones (%) (number of subjects with gallstones/total number of subjects in the specific group) (n = 2129)

   18 - 30 years

   >30 - 40 years

   >40 - 50 years

   >50 - 65 years

Gender

   female

   male

Positive family history

   yes

   no

BMI*

   < 18.5

   18.5 - < 25

   25 - < 30

   30 - < 35

   35 - < 40

   ≥ 40

Vitamin C supplementation

   yes

   no

Physical activity

   ≤ 2 h/week

   > 2 h/week

Alcohol consumption

   yes

   no

Caffeine consumption

   yes

   no

Total cholesterol*

< 4 mmol/l

4 - < 5 mmol/l

   5 - < 6 mmol/l

   ≥ 6 mmol/l

HDL cholesterol*

   < 1 mmol/l

   ≥ 1 mmol/l

LDL cholesterol*

   ≥ 4 mmol/l

   < 4 mmol/l

Triglycerides*

   ≥ 2.3 mmol/l

   < 2.3 mmol/l

Vegetarian diet

   yes

   no

Diabetes mellitus

   yes

   no

Waist circumference* (in cm)

   ≤ 90 (f)/≤ 100 (m)

   > 90 (f)/> 100 (m)

Waist to hip ratio*

   ≤ 0.8 (f)/≤ 0.9 (m)

   > 0.8 (f)/> 0.9 (m)

Smoking

   yes

   no