Table 2: Clinical features used for prediction.

LabelAgeSexSmokerGI Bleeding

Colonoscopy F = 159Yes = 57Yes = 12
M = 196Ex-smoker = 10No = 343
No = 274Unknown = 0
Unknown = 14

Normal F = 364Yes = 57Yes = 8
M = 269Ex-smoker = 14No = 623
No = 540Unknown = 2
Unknown = 22