HLTH 501 Biostatistics -50 Final review
Which study type is usually conducted at a point in time? - ✔ ✔ a
cross sectional survey
Odds ratio can be used to approximate the relative risk when the
disease under study is rare. - ✔ ✔ true
The proportion of the sample with disease is computed by taking the
ratio of the number with disease to the total sample size. - ✔ ✔ true
Calculate the lower quartile of the data set for 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. - ✔ ✔ 101.0 in excel:
"=QUARTILE(A1:A10,1)" or for third quartile: "=QUARTILE(A1:A10,3)"
Risk difference may sometimes be referred to as excess risk. - ✔ ✔
True
Confounding is the major issue in clinical trials. - ✔ ✔ false
Two thousand are enrolled in a 20-year cohort study. At the start of the
study, No one was diagnosed with cardiovascular disease. Over the
course of the study, 100 people who were free of cardiovascular
disease at baseline develop cardiovascular disease. The prevalence of
cardiovascular disease at baseline is 0. - ✔ ✔ True: Prevalence =
?the proportion of persons in a population who have a particular
disease or attribute at a specified point in time or over a specified
period of time.?
, What is the ideal study design from a statistical point of view? - ✔ ✔
Clinical trial
In a study measuring the frequency of pain scores of patients on a scale
from 1 to 10 for a specific type of pain relief therapy, the pain score
variable would best be described as which type of variable? - ✔ ✔
ordinal variable
Five hundred people are enrolled in a 10-year cohort study. At the start
of the study, 50 have diagnosed CVD. Over the course of the study, 40
people who were free of CVD at baseline develop CVD. The prevalence
of CVD at 10 years is 10% - ✔ ✔ false
Among individuals who eat a healthy diet and exercise frequently the
point prevalence of hypertension is 0.09. Individuals subject to poverty,
making it more difficult for them to eat a healthy diet and exercise
frequently, have a 0.31 point prevalence for hypertension. What is the
risk difference between the two groups? - ✔ ✔ .22: risk difference =
difference in point prevalence, cumulative incidence, or incidence rates
(PP,ex - PP,unex / CI,ex - CI,unex / IR,ex - IR,unex) = .31 - .09 = .22
Race is an example of which type of variable? - ✔ ✔ categorical
variable
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
Calculate the point prevalence for Alzheimer's disease among
individuals 65 years of age or older in a county that has 200,000
Which study type is usually conducted at a point in time? - ✔ ✔ a
cross sectional survey
Odds ratio can be used to approximate the relative risk when the
disease under study is rare. - ✔ ✔ true
The proportion of the sample with disease is computed by taking the
ratio of the number with disease to the total sample size. - ✔ ✔ true
Calculate the lower quartile of the data set for 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. - ✔ ✔ 101.0 in excel:
"=QUARTILE(A1:A10,1)" or for third quartile: "=QUARTILE(A1:A10,3)"
Risk difference may sometimes be referred to as excess risk. - ✔ ✔
True
Confounding is the major issue in clinical trials. - ✔ ✔ false
Two thousand are enrolled in a 20-year cohort study. At the start of the
study, No one was diagnosed with cardiovascular disease. Over the
course of the study, 100 people who were free of cardiovascular
disease at baseline develop cardiovascular disease. The prevalence of
cardiovascular disease at baseline is 0. - ✔ ✔ True: Prevalence =
?the proportion of persons in a population who have a particular
disease or attribute at a specified point in time or over a specified
period of time.?
, What is the ideal study design from a statistical point of view? - ✔ ✔
Clinical trial
In a study measuring the frequency of pain scores of patients on a scale
from 1 to 10 for a specific type of pain relief therapy, the pain score
variable would best be described as which type of variable? - ✔ ✔
ordinal variable
Five hundred people are enrolled in a 10-year cohort study. At the start
of the study, 50 have diagnosed CVD. Over the course of the study, 40
people who were free of CVD at baseline develop CVD. The prevalence
of CVD at 10 years is 10% - ✔ ✔ false
Among individuals who eat a healthy diet and exercise frequently the
point prevalence of hypertension is 0.09. Individuals subject to poverty,
making it more difficult for them to eat a healthy diet and exercise
frequently, have a 0.31 point prevalence for hypertension. What is the
risk difference between the two groups? - ✔ ✔ .22: risk difference =
difference in point prevalence, cumulative incidence, or incidence rates
(PP,ex - PP,unex / CI,ex - CI,unex / IR,ex - IR,unex) = .31 - .09 = .22
Race is an example of which type of variable? - ✔ ✔ categorical
variable
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
Calculate the point prevalence for Alzheimer's disease among
individuals 65 years of age or older in a county that has 200,000
