NR503 Midterm Questions with 100% Correct
Answers | Verified | Latest Update
Surveillance
used to monitor changes in disease frequency or to monitor changes in the levels of risk factors. Most
frequently conducted for infectious diseases "on going systemic collection, analysis, and
interpretation of health data" Descriptive
Rates
tells us how fast the disease in the population is occurring
Proportions
tell us what fractions of the population is affected
Incidence rate of a disease
is defined as the NEW number of cases of a disease that occur during a specific period of time in a
population at risk
Cumulative incidence
the incidence calculated using a period of time during which all of the individuals in the population
are considered to be at risk for the outcome
Person Time
when different individuals are observed at different times (person years)
Different Periods of time incidence rate
# of NEW cases/total person-time
Identifying New Cases in order to calculate incidence
knowing the baseline then re screening after a year to see the new cases that have developed
Attack Rate
number of people exposed to a suspect food who became ill/ # of people who were exposed to that
food
Prevalence
# of affected persons present in the population at a specific time/ # of persons in the population at
that time. This is view more of a snapshot through the population at a point in time.
prevalence=incidence*duration of disease
Point prevalence
prevalence of the disease at any time point during a certain time period (when you see the word
prevalence without any modifier it typically means point prevalence)
Period prevalence
how many people have had the disease at a certain point during a certain time period.
Answers | Verified | Latest Update
Surveillance
used to monitor changes in disease frequency or to monitor changes in the levels of risk factors. Most
frequently conducted for infectious diseases "on going systemic collection, analysis, and
interpretation of health data" Descriptive
Rates
tells us how fast the disease in the population is occurring
Proportions
tell us what fractions of the population is affected
Incidence rate of a disease
is defined as the NEW number of cases of a disease that occur during a specific period of time in a
population at risk
Cumulative incidence
the incidence calculated using a period of time during which all of the individuals in the population
are considered to be at risk for the outcome
Person Time
when different individuals are observed at different times (person years)
Different Periods of time incidence rate
# of NEW cases/total person-time
Identifying New Cases in order to calculate incidence
knowing the baseline then re screening after a year to see the new cases that have developed
Attack Rate
number of people exposed to a suspect food who became ill/ # of people who were exposed to that
food
Prevalence
# of affected persons present in the population at a specific time/ # of persons in the population at
that time. This is view more of a snapshot through the population at a point in time.
prevalence=incidence*duration of disease
Point prevalence
prevalence of the disease at any time point during a certain time period (when you see the word
prevalence without any modifier it typically means point prevalence)
Period prevalence
how many people have had the disease at a certain point during a certain time period.
