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Circle diameter corresponds to the weight of each study.
For dichotomous outcomes (complications), the prevalence was pooled and calculated using the inverse variance method as follows [53] (bar{p} = frac{{sum w_{i} p_{i} }}{{sum w_{i} }}) where p was the pooled prevalence, p i was the prevalence of complications of each study, w i was 1/var(p i), which was the weight of each study.
As information of an overall effect size and the relative weight of each study included in the review (e.g., in terms of sample size) is not included in the study by Van der Horst et al. [13], the premise behind the reported conclusion is not transparent.
Cochran's Q statistic [19] is provided by Q = Σ wiF (di−dF+ 2 where dF+ is the summary effect size by fixed effects, di are the study-specific effect sizes and wiF is the weight of each study (based on Mantel-Haenszel methods).
Sensitivity analysis was carried out to judge the weight of each study.
The weight of each study was calculated as the inverse of the variance/covariance matrix.
Similar(43)
Furthermore, we don't have the quality or quantitative weights of each study to be able to make a pooled conclusion on cost-effectiveness.
To avoid biasing estimates toward the studies with a larger sample size, we assigned a study weight to each individual such that the sum of weights for each study would be the same.
The ePPI Centre quality and relevance appraisal framework, 8 discussed in the proceeding section, was used to summarise the weight of evidence each study could contribute to the review's findings, and was an important component of the exclusion criteria.
Trained interviewers were responsible for height and weight measurements of each study child and each adult respondent.
This analysis grouped birth weight into two categories (classified into high and low birth weight in each study, regardless of specific weight in terms of grams), preventing evaluation of dose-response relationships.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com