ACING HLTH 501 BIOSTATISTICS EXAM WITH THE LATEST A+
UPDATE IN QUESTIONS AND ANSWERS FORMAT.
Point prevalence (PP)
=number of persons with disease/number of persons examined at baseline
Risk difference (RD)
=PPexposed-PPunexposed;
CIexposed-CIunexposed;
IRexposed-IRunexposed
Cumulative Incidence (CI)
=number of persons who develop disease during a specified period/number of persons
at risk at baseline
Population Attributable Risk (PAR)
=PPoverall-PPunexposed/PPoverall;
CIoverall-CIunexposed/CIoverall;
IRoverall-IRunexposed/IRoverall
Odds ratio (OR)
=PPexposed/(1-PPexposed)//PPunexposed/(1-PPunexposed);
CIexposed/(1-CIexposed)//CIunexposed/(1-CIunexposed)
relative risk (RR)
=PPexposed/PPunexposed;
CIexposed/CIunexposed
incidence rate (IR)
=number of persons who develop disease during a specified period/sum of the length of
time during which persons are disease free
Standard deviation (s)
mean (x)
median for odd
, The best numerical summaries for dichotomous, ordinal, and categorical
variables are relative frequencies.
True
Two types of medical devices used for knee replacement are being studied to see
if the type of knee replacement used affects the rate of infection for a specific
bacterial infection. The infection rate for a specific bacterial infection after
surgery for device A is 0.0043. The rate for the same bacterial infection is 0.0121
for device B. How does the risk of developing the bacterial infection in individuals
using device B compare to the risk of developing the bacterial infection in
individuals using device A?
Individuals using device B are 2.814 times more likely to develop the bacterial infection
of interest than individuals using device A.
Confounding is usually a major issue in cohort studies.
True
The population attributable risk is usually expressed as a percentage and ranges
from 0% to 100%.
True
The Cumulative incidence is computed as the number of persons who develop a
disease during a specified period over the number of persons examined at
baseline
False
A nested case-control study is a specific type of case-control study that is
usually designed from a cohort study.
True
A design that is a very detailed report of the specific features of a particular
participant or case is known as?
Case report
Calculate the mean blood glucose level for a study measuring the blood glucose
levels of 10 individuals whose blood glucose readings were as follows: 88, 97,
101, 104, 104, 107, 109, 117, 121, and 147.
109.5
UPDATE IN QUESTIONS AND ANSWERS FORMAT.
Point prevalence (PP)
=number of persons with disease/number of persons examined at baseline
Risk difference (RD)
=PPexposed-PPunexposed;
CIexposed-CIunexposed;
IRexposed-IRunexposed
Cumulative Incidence (CI)
=number of persons who develop disease during a specified period/number of persons
at risk at baseline
Population Attributable Risk (PAR)
=PPoverall-PPunexposed/PPoverall;
CIoverall-CIunexposed/CIoverall;
IRoverall-IRunexposed/IRoverall
Odds ratio (OR)
=PPexposed/(1-PPexposed)//PPunexposed/(1-PPunexposed);
CIexposed/(1-CIexposed)//CIunexposed/(1-CIunexposed)
relative risk (RR)
=PPexposed/PPunexposed;
CIexposed/CIunexposed
incidence rate (IR)
=number of persons who develop disease during a specified period/sum of the length of
time during which persons are disease free
Standard deviation (s)
mean (x)
median for odd
, The best numerical summaries for dichotomous, ordinal, and categorical
variables are relative frequencies.
True
Two types of medical devices used for knee replacement are being studied to see
if the type of knee replacement used affects the rate of infection for a specific
bacterial infection. The infection rate for a specific bacterial infection after
surgery for device A is 0.0043. The rate for the same bacterial infection is 0.0121
for device B. How does the risk of developing the bacterial infection in individuals
using device B compare to the risk of developing the bacterial infection in
individuals using device A?
Individuals using device B are 2.814 times more likely to develop the bacterial infection
of interest than individuals using device A.
Confounding is usually a major issue in cohort studies.
True
The population attributable risk is usually expressed as a percentage and ranges
from 0% to 100%.
True
The Cumulative incidence is computed as the number of persons who develop a
disease during a specified period over the number of persons examined at
baseline
False
A nested case-control study is a specific type of case-control study that is
usually designed from a cohort study.
True
A design that is a very detailed report of the specific features of a particular
participant or case is known as?
Case report
Calculate the mean blood glucose level for a study measuring the blood glucose
levels of 10 individuals whose blood glucose readings were as follows: 88, 97,
101, 104, 104, 107, 109, 117, 121, and 147.
109.5
