Question

**Problem 4: Distinguishing between Point and Period
Prevalence, Cumulative Incidence and Incidence Density at Happy
Kids Day Care Center (11 points)**

There were 11 children enrolled in the Happy Kids Day Care Center from the beginning of Month One until the end of Month Four. The 11 children were watched for a total of 4 months. The staff tries to keep good records about when children fall ill from disease X.

Child |
Month 1 |
Month 2 |
Month 3 |
Month 4 |
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1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
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11 |
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You are asked to inspect these records and report the following
information. The information has been assembled in the figure
above. **The grey bar indicates the disease is
present.** For ease of calculations consider one month is
equal to 30 days and disease begins on either the 1^{st} or
15^{th} of the month, except for Child #1 who was
** already** ill when record-keeping began.
Show all steps, including numerator and denominators. Express all
final answers as percentages (multiplier of
100).

- Calculate the point prevalence of disease X at the beginning of Month 1. (2 points)

Answer #1

Point prevalence is the proportion of a population that has the condition at a specific point in time.

The point prevalence of disease X at the beginning of Month 1

=(the number of children who were ill from disease X at the beginning of Month 1) / ( total number of children enrolled in the Happy Kids Day Care Center )

Here,the number of children who were ill from disease X at the beginning of Month 1= 1

Total number of children enrolled in the Happy Kids Day Care Center=11

Therefore, the point prevalence of disease X at the beginning of Month 1= 1/11=0.09090

the point prevalence of disease X at the beginning of Month 1 in terms of percentage= (1/11)*100=9.090

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