Chapter 3 Practice Problems Influenza! Epidemiologists, physicians, and teachers

Question

Chapter 3 Practice Problems Influenza! Epidemiologists, physicians, and teachers alike have noticed the cyclic occurrence of the dreaded influenza. Students afflicted with this disease are missing numerous days of school and struggling with their course work. 1. Physicians and teachers have been monitoring the situation at a local high school and diagnosing students with influenza. Their observations began with week 0, the last week in November. Their data are shown the following table: Week Newly Diagnosed with influenza 0 105 180 390 325 No influenza Diagnosis 1,025 920 740 350 25 0 (8) For weeks 1-4, calculate the prevalence and incidence rates, and express them as decimals. Be sure to remember that the denominator of incidence rates is the just population at risk not the entire population. a. Week New Cases Total Cases Individuals Weekly Prevalence rate at Risk at incidence the start of the week rate (6) From your data above, convert the incidence and prevalence rates to rates per 100 and fill in the table below with your answers. b. Week Weekly incidence Prevalence rate per 100 (%)

Explanation / Answer

Solutiona:

contingency table also called as confusion matrix

Solutionb:

sensitivity=the proportion of actual positive cases which are correctly identified.

Specifiicty==the prportion of actual negative cases which are correctly identified.

tp---true positive

tn---true negative

fp---false positve

fn---false negative

sensitivity=132/132+45=132/177=0.7457=74.57%

specificity=63650/63650+983

=0.984791

=0.984791*100

=98.48%

contingency table tp fp fn tn

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.