I'm reading the results of an individual patient data (IPD) meta-analysis. The outcomes of the study is expressed in standard deviations (SD's). Comparisons between groups are stated as 0,23 (95% CI 0.15-0.33), SD 0.34, etc. I can't grasp how to interpretate this. Can somebody help?
The point estimate is 0.23. Any sensible confidence interval for the parameter should include 0.23. The given confidence interval goes from [0.15, 0.33]. So 0.23 is near the middle. Generally 95% confidence intervals are reported but the confidence level is not stated. So you can't be sure, 90% and 99% are also common. The part where you wrote 0.34 SD's etc. is missing something. So I do not see how to interpret it. I might be able to with a more complete quotation. An estimate such as 0.23 (in your case is often given with the CI represented as + or - k standard errors (i.e. standard error is standard deviation of the estimate). But it may be that the estimate and the confidence interval are being expressed in units of standard deviations.
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