Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Pain
RCT	25 people with chronic pancreatitis, 80% alcohol-induced	Proportion of people who rated pain relief as "excellent" at day 4 67% with tramadol 20% with morphine Absolute numbers not reported	P <0.001	Effect size not calculated	tramadol