NQO1 and pancreatitis: Among the comparator subgroups by 5-ASA release mechanism, crude pancreatitis IRs (95 % CI) were lowest in the azoreductase-dependent group [5.11 (0.90–28.92) per 1,000 person-years] and highest in the moisture-dependent group [10.88 (2.98–39.68) per 1,000 person-years].