Oncology & Cancer

Making sense of mammography guidelines

Experts agree that detecting breast cancer early offers a better outlook, but when to start screenings and how often to have them has changed repeatedly.

Obstetrics & gynaecology

Earth's population could shrink in a few decades

"As women become better educated and gain access to birth control, they don't want to have as many children," says Professor Chris Murray, head of the Institute for Health Metrics and Evaluation (IMHE) in the United States.

Health

Access to health care has little impact on longevity

(HealthDay)—Health care has modest effects on extending life expectancy in the United States, while behavioral and social determinants may have larger effects, according to a review published in the May/June issue of the ...

Health

How long can humans live?

Humans are living longer around the world. While there have been obvious ups and downs, life expectancy at birth overall has been steadily increasing for many years. It has more than doubled in the last two centuries.

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Life expectancy

Life expectancy is the average number of years of life remaining at a given age. The term is most often used in the human context, but used also in plant or animal ecology and the calculation is based on the analysis of life tables (also known as actuarial tables). The term may also be used in the context of manufactured objects although the related term shelf life is used for consumer products. Life expectancy is heavily dependent on the criteria used to select the group. For example, in countries with high infant mortality rates, the life expectancy at birth is highly sensitive to the rate of death in the first few years of life. In these cases, another measure such as life expectancy at age 5 (e5) can be used to exclude the effects of infant mortality to reveal the effects of causes of death other than early childhood causes.

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