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Mortality from ischaemic heart disease in Poland in 1991-1996 estimated by the coding system used since 1997

Bogdan Jasiński1, Piotr Bandosz, Bogdan Wojtyniak

  • 1Cardinal Stefan Wyszyński Institute of Cardiology, Warsaw, Poland. bjasinski@kard.pl

Kardiologia Polska
|May 22, 2010
PubMed

Insights

Coding changes in Poland led to apparent increases in ischaemic heart disease (IHD) deaths. A new method corrects these figures, revealing more accurate long-term IHD mortality trends.

Area of Science:

  • Cardiovascular epidemiology
  • Public health statistics

Background:

  • Official mortality data in Poland (1991-2005) are inconsistent due to coding system changes after 1996.
  • Apparent increases in ischaemic heart disease (IHD) and decreases in atherosclerosis deaths between 1996-1999 complicate trend analysis and international comparisons.

Purpose of the Study:

  • To develop a reliable method for estimating actual IHD deaths in Poland from 1991-2005.
  • To address inconsistencies in statistical data caused by coding system modifications.

Main Methods:

  • Utilized individual death records from the Central Statistical Office (CSO) and WHO Mortality Database.
  • Employed a regression model leveraging the consistency of IHD mortality data within periods defined by different coding systems (pre-1997 and post-1997).

Main Results:

  • The pre-1997 coding system underestimated IHD deaths by approximately 35% in 1991 compared to the post-1997 system.
  • Significant approximate relative errors in official IHD death counts were observed across various age groups and sexes in 1991.

Conclusions:

  • The noted rise in IHD mortality in Poland (1996-1999) was an artifact of pre-1997 coding inaccuracies, primarily affecting IHD, atherosclerosis, and cerebrovascular disease.
  • The developed method allows for accurate correction of IHD death numbers (1991-1996) and facilitates long-term mortality trend assessment, including treatment and prevention effectiveness evaluations.
Abstract

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