Answered: The image attached of 100 squares…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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Question

The image attached of 100 squares represents a population of people that was stable in size and followed for 2 years for the emergence of a disease. Blue squares represent people in the population that were unaffected by disease over the whole study period. Red squares represent people in the population identified as having disease at the start of the study. The yellow squares were people in the population that were disease free at the start, but developed disease in the subsequent 2 year period. Assume everyone survives to the end of the study period whether or not they develop disease.

1) Based on the image and study description above, what was the prevalence of disease in the population at the start of the study?

A) 0%

B) 36%

C) 38%

D) 62%

2) Based on the image above and study description, what was the 2-year cumulative incidence of new disease over the study?

A) 26.0%

B) 62%

C) 40.6%

D) 36%

3) Based on the image above and study description, what is the prevalence of disease in the population after 2 years?

A) 62%