Ex-post facto studies are also called

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Nursing Research & Statistics

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Explanation

Ex-post facto literally means "from after the fact" in Latin, indicating the research is conducted after the event of interest has already occurred.
In this type of study, the researcher cannot control or manipulate the independent variable because it is a pre-existing condition (e.g., a patient's history of smoking).
The primary goal is to examine the relationship or association between this pre-existing independent variable and a dependent variable (e.g., lung cancer).
This focus on the relationship between variables without manipulation is the definition of correlational research.

Option A: Longitudinal studies collect data over an extended period, following subjects forward in time (prospectively). This is the opposite of ex-post facto research, which is retrospective (looks backward in time).
Option B: Descriptive research aims to describe the characteristics of a population or phenomenon. While ex-post facto studies have descriptive elements, their main purpose is to explore relationships, not just describe.
Option D: Exploratory research is conducted when a problem is not well-defined. It's a preliminary study to gain insights, not to test a hypothesis about a past event, which is the focus of ex-post facto research.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of research designs as background academic context rather than a clinical decision trigger.
Nurses often use ex-post facto research principles to understand patient outcomes when conducting a randomized controlled trial is unethical or impractical. For example, a nurse could retrospectively study the charts of patients who developed pressure ulcers to identify common risk factors (like immobility or nutritional status) that were present before the ulcer formed.
This design is crucial in epidemiology for identifying risk factors for diseases by comparing a group with the disease (cases) to a group without it (controls) and looking back at their past exposures.
What if? If a researcher wanted to actively assign one group of patients to a new skin care protocol and another to a standard protocol to see who develops fewer pressure ulcers, the design would change from ex-post facto to an experimental or quasi-experimental study, as the researcher would be manipulating the independent variable (the protocol).

How to Approach the Question

First, understand the meaning of the key term 'ex-post facto,' which translates to 'after the fact.'
Recognize that this implies the research looks backward at events, conditions, or variables that have already occurred and are not manipulated by the researcher.
Consider the primary goal of such a study: to find a connection or relationship between a past event (cause) and a present outcome (effect).
Evaluate the options: 'Longitudinal' is forward-looking. 'Descriptive' focuses on 'what is' rather than 'why'. 'Exploratory' is for new topics.
'Correlation' specifically refers to studying relationships between variables, which perfectly aligns with the goal of an ex-post facto study.

Concept Tested & Keywords

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E6 NursingResearch Suresh Sharma 5e Part 1 p. 181-183

E6 NursingResearch Polit 11e Part 1 p. 209-211