A review of the non-equivalent control group post-test-only design
Preetha Krishnan Nurse practitioner, Winnipeg Regional Health Authority, Winnipeg MB, Canada, and graduate student, College of Nursing, University of Manitoba, Winnipeg MB, Canada.
Background Quantitative research designs are broadly classified as either experimental or quasi-experimental. The main distinguishing feature of the quasi-experiment is the manipulation of the independent variable without randomisation. When randomisation or use of a control group is unfeasible, a researcher can choose from a range of quasi-experimental designs.
Aim To present the features of the quasi-experimental ‘non-equivalent control group post-test-only’ design, which aims to demonstrate causality between an intervention and an outcome.
Discussion This paper provides an overview of the non-equivalent control group post-test-only design in terms of its design features, applications and statistical analysis, as well as its advantages and disadvantages.
Conclusion The non-equivalent control group post-test-only design can be used in natural settings, where randomisation cannot be conducted for ethical or practical reasons. Although the design is less complex than some other designs, with low error propagation, it is vulnerable to threats to internal validity.
Krishnan P (2018) A review of the non-equivalent control group post-test-only design. Nurse Researcher. doi: 10.7748/nr.2018.e1582
This article has been subject to external double-blind peer review and has been checked for plagiarism using automated software
Conflict of interest
Published online: 18 September 2018
Want to read more?
Already subscribed? Log in
Unlock full access to RCNi Plus today
Save over 50% on your first 3 months
Your subscription package includes:
- Unlimited online access to all 10 RCNi Journals and their archives
- Customisable dashboard featuring 200+ topics
- RCNi Learning featuring 180+ RCN accredited learning modules
- RCNi Portfolio to build evidence for revalidation
- Personalised newsletters tailored to your interests
Alternatively, you can purchase access to this article for the next seven days. Buy now