An unpaired t-test (also known as an independent t-test) is a statistical procedure that compares the averages/means of two independent or unrelated groups to determine if there is a significant difference between the two
Specific protection refers to precise actions taken to protect against the development of particular disease conditions, and includes vaccination, chemoprophylaxis, etc.
The crude birth rate indicates the number of live births within the population of a given geographical region in a given year. It is calculated by dividing the number of annual live births by the estimated population size at midyear multiplied by 1,000.
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