A nurse who works in a gerontology clinic is asked to examine the effectiveness of Vitamin D in improving bone mineral density among older clients. The nurse evaluates four recent studies on the topic.
Which study provides the best evidence to support the use of vitamin D?
A meta-analysis that concluded that bone density improved among individuals who took Vitamin D.
A cross-sectional study that found a strong relationship between Vitamin D intake and bone density.
A cohort study that concluded low levels of Vitamin D were linked to decreased bone mineral density.
A time series design study that reported that those who took Vitamin D had improved bone density.
The Correct Answer is A
Choice A rationale:
A meta-analysis that concluded that bone density improved among individuals who took Vitamin D. Rationale: A meta-analysis provides the highest level of evidence among the options listed. It synthesizes data from multiple studies, often randomized controlled trials (RCTs), to draw conclusions about the effectiveness of an intervention. In this case, the meta-analysis concluded that bone density improved among individuals who took Vitamin D, suggesting strong evidence to support its use.
Choice B rationale:
A cross-sectional study that found a strong relationship between Vitamin D intake and bone density. Rationale: Cross-sectional studies can identify associations between variables but cannot establish causality. While this study found a strong relationship, it does not provide as strong evidence as a meta-analysis of RCTs.
Choice C rationale:
A cohort study that concluded low levels of Vitamin D were linked to decreased bone mineral density. Rationale: Cohort studies can provide valuable evidence, but they may have limitations, such as confounding variables. While this study suggested a link, it may not be as robust as a meta-analysis of RCTs.
Choice D rationale:
A time series design study that reported that those who took Vitamin D had improved bone density. Rationale: Time series designs can be useful for assessing changes over time, but they may have limitations in terms of establishing causality. Additionally, the strength of evidence from a single time series study may not be as high as that from a meta-analysis of multiple RCTs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
True random sampling. True random sampling ensures that each client discharged from the postoperative orthopedic unit after joint replacement surgery has an equal and independent chance of being selected for the study. This approach minimizes bias and enhances the generalizability of the study findings to the entire population of interest.
Choice B rationale:
Stratified random sampling involves dividing the population into subgroups (strata) and then randomly selecting samples from each stratum. While this approach can be useful for ensuring representation of specific subgroups, it may not be necessary if the goal is to have an equal chance of participation for all clients.
Choice C rationale:
Convenience sampling involves selecting participants based on their availability and accessibility. It is not suitable for this study, as it may introduce bias and not ensure equal chances of participation for all clients.
Choice D rationale:
Quota sampling involves selecting participants based on predefined quotas for specific characteristics. It is not the most suitable method for ensuring equal chances of participation for all clients in this study.
Correct Answer is A
Explanation
Choice A rationale:
A meta-analysis that concluded that bone density improved among individuals who took Vitamin D. Rationale: A meta-analysis provides the highest level of evidence among the options listed. It synthesizes data from multiple studies, often randomized controlled trials (RCTs), to draw conclusions about the effectiveness of an intervention. In this case, the meta-analysis concluded that bone density improved among individuals who took Vitamin D, suggesting strong evidence to support its use.
Choice B rationale:
A cross-sectional study that found a strong relationship between Vitamin D intake and bone density. Rationale: Cross-sectional studies can identify associations between variables but cannot establish causality. While this study found a strong relationship, it does not provide as strong evidence as a meta-analysis of RCTs.
Choice C rationale:
A cohort study that concluded low levels of Vitamin D were linked to decreased bone mineral density. Rationale: Cohort studies can provide valuable evidence, but they may have limitations, such as confounding variables. While this study suggested a link, it may not be as robust as a meta-analysis of RCTs.
Choice D rationale:
A time series design study that reported that those who took Vitamin D had improved bone density. Rationale: Time series designs can be useful for assessing changes over time, but they may have limitations in terms of establishing causality. Additionally, the strength of evidence from a single time series study may not be as high as that from a meta-analysis of multiple RCTs.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.