Which of the following is a limitation of literature reviews?
There is conflicting evidence between trials as not enough trials have been done or studies have been too small.
There may be significant heterogeneity (variation) among included studies in the data, methods, and results.
A review of all of the available data/information results in a more wholesome view of the topic.
All of the above.
The Correct Answer is B
A literature review is a systematic or narrative synthesis of existing scholarly work designed to provide a comprehensive overview of a specific research area. While essential for establishing evidence-based practice, these reviews are often complicated by inconsistencies in study design and reporting. Identifying methodological flaws and publication bias is a critical component of assessing the reliability of the summarized findings.
Rationale:
A. Conflicting evidence due to insufficient sample sizes or a low quantity of trials is a characteristic of the underlying primary research rather than a direct limitation of the review process itself. While a review identifies these gaps, the primary goal of the synthesis is to aggregate what exists. It highlights the scarcity of data rather than serving as a structural weakness of the review methodology.
B. Significant heterogeneity represents a major limitation because variations in participant demographics, clinical settings, and outcome measures make it difficult to draw a unified conclusion. When studies differ vastly in their statistical methods or data collection, a meta-analysis may become inappropriate or misleading. This lack of uniformity complicates the ability to generalize findings to a broader clinical population.
C. Achieving a more wholesome view of a topic is considered a primary benefit or strength of a literature review rather than a limitation. By consolidating multiple perspectives and findings, the review helps eliminate information silos and provides a foundation for future research. This comprehensive nature is the main reason healthcare professionals rely on reviews for clinical decision-making.
D. This choice is incorrect because only the presence of study variation serves as a functional limitation in this context. While reviews have multiple drawbacks, such as selection bias, not all statements provided describe a negative constraint. Identifying the specific logistical challenges of evidence synthesis is necessary to maintain a high level of scientific rigor in academic evaluation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Step 1 is to calculate the Least Weighable Quantity (LWQ)
LWQ = (Sensitivity Requirement ÷ Acceptable Error) × 100
(5 ÷ 5) × 100
5 ÷ 5 = 1
1 × 100 = 100
Result at this step = 100 mg
Step 2 is to determine the drug multiplication factor
Since the required dose is 5 mg and we must weigh at least 100 mg:
Factor = 100 ÷ 5
100 ÷ 5 = 20
Result at this step = 20
Step 3 is to calculate the total mixture weight (drug + diluent)
Total Mixture = Aliquot weight × Factor
100 × 20 = 2000
Result at this step = 2000 mg
Step 4 is to calculate the amount of diluent needed
Diluent = Total Mixture - Drug weight
2000 - 100 = 1900
Result at this step = 1900 mg
Correct Answer is A
Explanation
The body stores energy in various forms to ensure a constant supply of fuel during fasting or high metabolic demand. These macronutrients differ in their chemical structure and the amount of energy released upon complete oxidative catabolism. Energy density is measured in kilocalories per gram (kcal/g). Efficient storage is necessary to minimize the physical mass of the body's energy reserves.
Rationale:
A. Fat (lipids) possesses the highest energy density at approximately 9 kcal/g. This is because fatty acid chains are highly reduced hydrocarbons, allowing them to release more energy when oxidized to CO2 and water. Furthermore, fat is stored in a relatively anhydrous (water-free) state, maximizing the caloric value per unit of mass.
B. Carbohydrates provide approximately 4 kcal/g of energy. They are stored as glycogen in the liver and skeletal muscle. Glycogen is a hydrophilic molecule and is stored with a significant amount of water, which greatly reduces the overall energy-to-weight ratio compared to the dense storage found in adipose tissue.
C. This choice is scientifically incorrect as the macronutrients do not provide equal energy. The caloric yield is determined by the oxidation state of the carbon atoms in the molecule. Fats are significantly more energy-dense than both proteins and carbohydrates, yielding more than double the energy per gram than the other two.
D. Protein also provides approximately 4 kcal/g of energy. While the body can use protein for energy through gluconeogenesis or direct oxidation of carbon skeletons, it is primarily used for structural and functional purposes. Using protein as a primary energy store is inefficient and leads to the loss of muscle mass.
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