Abstract
Higher death rate experiences by males than by females frequently have been attributed largely to biological factors. This excess mortality for males has been increasing at most adult ages in recent years in the United States when mortality for both sexes has been declining. The trends in specific causes of death for different age groups and suggests that environmental factors may have an important role in the widening sex differential in mortality. The largest increases in the sex mortality ratios are found for age groups 15 to 24 years and 45 to 64 years. Increases in the sex mortality ratios are largely the result of recent trends in rates for a few important causes of death for which trends are of two types: "declines in causes of death importantly affecting females (tuberculosis, maternal mortality, cancer of the uterus and diseases associated with high blood pressure), and increases in male death rates for motor vehicle accidents, lung cancer, and coronary heart disease.".

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