Introduction
In any academic study, there are inevitably going to be limitations to the study that have to be taken into account when evaluating the results of the study. The authors are supposed to build these limitations into their conclusions, but if they do not then the reader must. Therefore, it is important to understand what the limitations of any given study are, and how they might have influenced the results.
Britz & Dunn
Britz & Dunn (2009) studied the relationship between self-care and quality of life. The authors begin with the hypothesis that decreased quality of life among patients with heart failure arise from self-care deficits. In other words, if people don't look after themselves the don't do as well. So, rocket science, but okay.
The limitation of this study are listed by the authors as having a small sample size and the potential homogeneity of the sample. These two limitations can influence the ability of a researcher to extrapolate these results across a wider population. A small samples size can reduce the reliability of the results. Homogeneity of the subjects makes the findings less reliable across a wider population, because in that case the sample is not representative of the entire population. The sample can still be representative of a population, just not the broadest segment; it would still be representative of members of that particular in-group.
The authors posit that there is another limitation. However, they are poor writers and cannot actually explain in clear language what this limitation is. Terms like "low reliabilities" and "subscale alphas" are used to describe the limitation, but those words have no meaning unless given context, which they are not. Extra credit for the five dollar word "coefficient" and for referencing a Greek letter. Writing rambling gobbledegook is less a limitation of the study than of the authors themselves, who with such purple prose cast doubt as to their knowledge of the subject matter. If they knew what they were talking about, they would be able to express their ideas clearly and simply, rather than hiding behind a blizzard of academic buzzwords.
The study was conducted with a convenience sample from a single hospital. They made a point to exclude patients from facilities where they receive care, to isolate patients who were responsible for self-care. The patients...
References
Britz, J. & Dunn, K. (2009) Self-care and quality of life among patients with heart failure. Journal of the American Academy of Nursing Practitioners. Vol. 22 (2010) 480-487.
Tang, H., Sayers, S., Weissinger, G. & Riegel, B. (2014) The role of depression in medication adherence among heart failure patients. Clinical Nursing Research. Vol. 23 (3) 231-244.
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