Context. - Coronary heart disease is the major cause of mortality in the United States.
Factors associated with coronary risk are important to identify.
Coronary mortality is greater during the winter months.
- To investigate whether declining coronary mortality has been accompanied by a change in the seasonal pattern and to investigate the hypothesis that diminishing exposures to environmental cold and heat have affected the seasonal pattern.
- We used published data on coronary mortality by year to evaluate the time trend in the seasonal pattern.
We fit a sine curve to the monthly frequency of deaths in each year and examined the trend over time in the ratio of the peak to the trough of the curve.
- We used monthly coronary deaths in the United States from 1937 through 1991.
Deaths by cause and month were not available by geographic area within the United States, but we were able to examine total monthly deaths in 2 regions with contrasting climates, New England and the South.
- We used the yearly peak-to-trough ratio as our primary outcome and assessed its trend over time by linear regression.
We also depicted the time trends using polynomial smoothing.
- The peak-to-trough ratio diminished by about 2% per year until around 1970, when the trend reversed.
In New England, the decline was steeper than in the South, as measured from all deaths.
Mots-clés Pascal : Cardiopathie coronaire, Epidémiologie, Facteur risque, Variation saisonnière, Enquête socioéconomique, Evaluation, Mortalité, Homme, Etats Unis, Amérique du Nord, Amérique, Appareil circulatoire pathologie, Cardiopathie
Mots-clés Pascal anglais : Coronary heart disease, Epidemiology, Risk factor, Seasonal variation, Socioeconomical inquiry, Evaluation, Mortality, Human, United States, North America, America, Cardiovascular disease, Heart disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0505821
Code Inist : 002B12A03. Création : 13/02/1998.