If a disease has an incidence rate of 0.1% in a population of 1,000,000, how man

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Question: If a disease has an incidence rate of 0.1% in a population of 1,000,000, how many new cases are expected in a year? (2022)

Options:

Correct Answer: 100

Exam Year: 2022

Solution:

Expected new cases = 0.1% of 1,000,000 = 0.001 * 1,000,000 = 100 cases.

If a disease has an incidence rate of 0.1% in a population of 1,000,000, how many new cases are expected in a year? (2022)

If a disease has an incidence rate of 0.1% in a population of 1,000,000, how many new cases are expected in a year? (2022)

Step 1: Understand the incidence rate. The incidence rate is given as 0.1%.
Step 2: Convert the percentage to a decimal. 0.1% as a decimal is 0.001 (because 0.1% = 0.1/100).
Step 3: Identify the total population. The total population is 1,000,000.
Step 4: Calculate the expected new cases by multiplying the incidence rate (as a decimal) by the total population. This means you calculate 0.001 * 1,000,000.
Step 5: Perform the multiplication. 0.001 * 1,000,000 equals 100.
Step 6: Conclude that the expected number of new cases in a year is 100.

Incidence Rate – The incidence rate is the number of new cases of a disease in a specified population over a certain period of time, expressed as a percentage.
Population Size – Understanding the total population size is crucial for calculating the expected number of new cases based on the incidence rate.
Percentage Calculation – Converting a percentage to a decimal and applying it to a population size to find the expected number of cases.