Life expectancy at birth is a summary measure of mortality. In a population with a life expectancy at birth of 70 years, which statement is correct?
- A A newborn is expected to live 70 years on average if current age-specific mortality rates persist ✓
- B Every person in the population will live exactly 70 years
- C The average age at death in the population is 70 years
- D 70% of the population survives to age 70
Correct answer: A. A newborn is expected to live 70 years on average if current age-specific mortality rates persist
Explanation
Life expectancy at birth is the average number of years a newborn would live if current age-specific mortality rates remain constant throughout their lifetime. It is a hypothetical cohort measure, not a prediction for any individual. It is derived from a life table and reflects the overall mortality pattern of the population at a given time.
Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.
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