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Table 2 Principal stone types:

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

   Intermediate substances  
Main substances   none Apatite Aragonite Bilirubin Bilirubin Apatite Chol. Chol. Calcite Chol. Palmitate Ca Ca Apatite Ca Bilirubin Calcite Calcite Bilirubin Palmitate Struvite Polysaccharide  
Cholesterol   0.860 0.001   0.041 0.001     0.006   < 0.001 0.002      0.911
Cholesterol Bilirubin 0.013 < 0.001             < 0.001    0.014
Cholesterol Bilirubin, Apatite 0.003                 0.003
Cholesterol Calcium 0.004    0.001              0.005
Bilirubin   0.021 0.001 < 0.001    0.002   0.001   < 0.001     0.001    0.027
Bilirubin Apatite 0.005       0.001   < 0.001         0.006
Bilirubin Aragonite 0.003                 0.003
Bilirubin Calcium 0.001                 0.001
Apatite      < 0.001          < 0.001     0.001
Apatite Colesterol     < 0.001              < 0.001
Apatite Calcium < 0.001                 < 0.001
Aragonite   0.006      0.003            0.009
Aragonite Colesterol     < 0.001              < 0.001
Calcium   0.002    0.002   0.001           0.001 0.006
Calcite   0.007               0.001   0.008
Calcite Apatite 0.001                 0.001
Calcite Cholesterol 0.001                 0.001
Stearate   0.001                 0.001
Polysaccharide                  0.001 0.001
                   1
  1. The main and intermediate substances from all 2148 FTIR measurements are displayed in this cross-table. It is evident, that the various stone components are not mixed at random but rather fall into few, specific categories. Cells with "pure" stones and a frequency above 1% are marked in bold print. The combination of cholesterol and bilirubin (two cells) is marked in underlined italics. Values of "< 0.001" correspond to single observations. Abbreviations in the Table heading: Chol. Corresponds to Cholesterol and Ca corresponds to Calcium.