Basic Science - Stats and Research

Question 1

Level 1 Evidence

Answer 1

Randomized controlled trial (RCT): a study in which patients are randomly assigned to the treatment or control group and are followed prospectively

Question 2

Level 2 Evidence

Answer 2

Prospective cohort study a study in which patient groups are separated non-randomly by exposure or treatment, with exposure occurring after the initiation of the study

Question 3

Level 3 Evidence

Answer 3

Retrospective cohort study: a study in which patient groups are separated non-randomly by exposure or treatment, with exposure occurring before the initiation of the study Case-control study: a study in which patient groups are separated by the current presence or absence of disease and examined for the prior exposure of interest

Question 4

Level 4 Evidence

Answer 4

Case series a report of multiple patients with the same treatment, but no control group or comparison group

Question 5

Level 5 Evidence

Answer 5

Case report (a report of a single case) Expert opinion Personal observation

Question 6

In which of the following types of studies can an incidence rate be determined?

Answer 6

Prospective cohort

Question 7

A study of patients undergoing total hip arthroplasty has been completed that compares the length of time it takes the patients to walk without aids to their age. What statistical technique should be used to analyze the data?

Answer 7

Linear regression

Question 8

cohort study definition

Answer 8

groups are separated non-randomly by exposure or treatment

can be level II (prospective) or level III (retrospective)

follows a particular group in relation to an event, studying them at intervals in time
and uses objective outcome criteria.

Question 9

case control study definition

Answer 9

all the subjects are selected based on whether they
have (cases) or do not have (controls) the disease or outcome of interest.

Case control studies are retrospective as they always look back to see how a certain risk factor may be
different between the two groups.

Question 10

Type of study to report outcome with RR

Answer 10

cohort

Cohort studies follow a group of individuals over time and are optimal for studying the incidence, course, and risk
factors of a disease.

Question 11

Type of study to report outcome with odds radio?

Answer 11

case-control

Question 12

best wound vac setting

Answer 12

125 mm Hg