Ecological study of reasons for sharp decline in mortality from ischaemic heart disease in Poland since 1991

Objective: To investigate the reasons for the decline in deaths attributed to ischaemic heart disease in Poland since 1991 after two decades of rising rates.

Cumulative risk adjusted mortality chart for detecting changes in death rate: observational study of heart surgery

Objective: To detect changes in mortality after surgery, with allowance being made for variations in case mix.