In introductory statistics, what does the infant mortality rate (IMR) measure?

• A. The percentage of all births that result in twins or higher-order multiples
• B. The number of stillbirths per $1000$ total pregnancies
• C. The number of deaths of pregnant people per $100000$ live births
• D. The number of deaths of infants under age 1 per $1,1000$ live births in a given year (often for a specified area)

Answer: (D)

Verified step by step guidance

1. Understand that the infant mortality rate (IMR) is a demographic and health indicator used in statistics to measure the frequency of infant deaths.
2. Recognize that IMR specifically counts the number of deaths of infants under the age of 1 year.
3. Note that IMR is calculated relative to the number of live births, not total pregnancies or stillbirths.
4. Express the IMR as the number of infant deaths per 1,000 live births in a given year and area, which standardizes the measure for comparison.
5. Summarize that the IMR provides insight into the overall health and living conditions affecting infants in a population.