Serum bilirubin concentrations.

(A) The cumulative proportion of patients developing a serum bilirubin concentration higher than 50 μM, and (B) the number of patients with serum bilirubin higher than 50 μM at each time of measurement. Statistically significantly fewer patients in the group given UDCA exceeded this blood level (2.5 times the upper limit of normal), and, with one exception, the number of patients exceeding this level was always higher in the group not given UDCA.