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Table 4 Exploratory analysis of stone composition in 1025 unrelated index patients.

From: Predictors of gallstone composition in 1025 symptomatic gallstones from Northern Germany

  B C CB O
N 19 846 85 75
stone weight 0.6 (0.2–1.1) g 1.6 (0.7–3.4) g 2.0 (1.0–4.9) g 0.7 (0.2 – 1.5) g
%male 58% 23% 38% 28%
BMI 25.5 (23.1 – 29.1) 27.1 (24.7 – 30.4) 27.1 (25.0 – 29.1) 27.0 (23.7 – 29.0)
parity (females) 2 (2 – 2) 2 (1 – 3) 2 (1 – 2) 2 (2 – 2)
age of operation 60 (48 – 63) 53 (43–60) 56 (44–62) 55 (47 – 61)
family history 53% 46% 45% 36%
  1. For quantitative measures (stone weight, BMI, parity, age of operation), the median and interquartile range are reported. Other measures are expressed as percentages. The family history refers to a positive family history of gallstones (either history of cholecystectomy or self-reported presence of gallstone based on previous sonography) in a first degree relative.