QuestionSBA
QuestionChoice
The summary measure of the meta-analysis is portrayed as a diamond, with the vertical points lying on the mean effect and the horizontal points measuring the confidence intervals
33053
a
The width of the diamond corresponds to the 95% confidence interval of the summary measure
QuestionChoice
The 95% confidence intervals, represented as the horizontal edges of the summary measure diamond, do not overlap with the odds ratio of 1 and therefore, there is a significant effect of corticosteroids on neonatal mortality (mean odds ratio 0.53)
33054
b
There is no significant effect of corticosteroids on neonatal mortality
QuestionChoice
The heterogeneity, or I squared, is often used in forest plots, but it is not shown in the data set here. Heterogeneity is the degree to which data from multiple studies displaying the same effect overlap each other. The more heterogeneous the studies are within the met-analysis, the less conclusive the data is
33056
d
The heterogeneity of the study is 0.53
QuestionChoice
The area of the squares correspond to the proportional study's weight in the meta-analysis and is unrelated to the p-value
33055
c
The area of the square corresponds inversely to the study's p-value
QuestionChoice
The forest plot will include all studies investigated, regardless of their outcomes, analysed to determine the standardised mean difference, represented as the diamond in the bottom right of the image
33057
e
Only the Auckland study showed significance, and so the other studies' results can be discounted
QuestionComment
Fix the graph man.
6262
User
subscriber
Uwave Edema
Concept
Chapter
# Definition

A meta-analysis is a study which combines the results of multiple studies to increase the statistical power of the results.

Meta-analyses are often conducted as part of a systematic review.

# Advantages

Meta-analyses offer several advantages, such as increasing the statistical power and increasing the precision/reliability of the data.

# Disadvantages

Meta-analyses do have the problem that they cannot control for bias or experimental error if these are present in the included studies.
2018
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Properties of meta-analyses
Topic
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Medical Statistics
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The summary measure of the meta-analysis is portrayed as a diamond, with the vertical points lying on the mean effect and the horizontal points measuring the confidence intervals
Picture
Thomas Lumley, User:HLHJ, GPLv2 <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, via Wikimedia Commons
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Topic
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Medical Statistics
The following diagram is a forest plot from a systematic review by Crowley et al. showing the results of seven studies looking at the effect of corticosteroids on hastening neonatal lung development when given to women about to give birth prematurely.

[lightgallery]

Which of the following statements is correct?
a