Discussion
What are the data requirements for calculating Infant Mortality Rate ?
Answer: D
The official key gives all the above for the data needed to calculate the infant mortality rate.
The basic rate is the number of deaths under one year in a year divided by the live births of that year, so one year of data is enough. Refinements use two consecutive years, because some infants who die in a year were born in the previous one, and a three-year average is used where numbers are small and the rate fluctuates.
Since each of A, B and C is used in some form, the key takes D. This is a matter of practice, so the key is kept as published.
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