What does "population at risk" (PAR) refer to in epidemiological studies?Select one alternative:Members of the population who are capable of developing the disease or condition being studied.Only individuals who have already developed the disease or condition being studied.Members of the population who are actively immune to the disease or condition being studied.Only individuals who are incapable of developing the disease or condition being studied.

What is the primary difference between risk and prevalence?1 pointPrevalence describes the number of diseased persons present in the population divided by the number of persons in the population in a specified time period, whereas risk describes the number of newly diseased person present in the population divided by the number of at-risk persons in the population in a specified time period. Prevalence describes the number of diseased person present in the population in a specified time period whereas risk describes the number of people who die from the disease in the population in a specified time period.Risk describes the number of diseased persons present in the population divided by the number of persons in the population during a specified time period, whereas prevalence describes the number of newly diseased person present in the population in a specified time period divided by the number of at- risk persons in the population.

Once the study population has been defined, the denominator of a risk is affected by which of the following? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)1 pointloss to follow-upmigration who is at risk of developing the health outcomedeathsbirths

True or False: The denominator of a risk is not fixed by the “at-risk” population size at the beginning of a study observation period. 1 pointTrueFalse

In order to calculate a risk, which of the following steps must be taken? (You must choose all that apply to receive credit for this question; no partial credit will be awarded.)1 pointdetermine the number of males and females in the studydefine a case definition for the health outcome under studydetermine the number of new cases of the outcome under studydetermine how many people in the study were exposed or unexposed to the exposure under studydefine the at-risk study population

Epidemiologists study the distribution and determinants of diseases in human populations:Question 8Answera.Trueb.False