Exercise 1 (Mean and SD)
Specialized care by specialists has become available for patients hospitalized with strokes.
Nine studies have reported on the effectiveness of this care, and the following results were obtained when comparing length of hospital stay (LOS).
Analyze the data by incorporating mean and standard deviation (SD) of the studies.
(Normand, 1999; Cochran Database of Systematic Reviews, 1995）
Comparative verification test
SPSS has had meta-analysis since version 28, but the version used was an earlier version, so we were unable to test it this time.
EZR shows the results of only the difference in means (fixed-effects model).
Variability across studies τ^2: 218.72 in StatFinale and 684.64 in EZR, which is different.
In the cited literature, it is 218.72, the same as StatFinale, so the calculation method for EZR may be different.
Heterogeneity test: P = 1.35E-47 in StatFinale, P < 0.01 in EZR.
Q test (Chi square statistic): P = 7.89E-06 in StatFinale, no test results were found in EZR.
Conclusion: The length of hospital stay is significantly reduced by an average of 3.5 days. However, there is a very large variability among studies.
Reports of EZR
We edited the StatFinale results to match the EZR results. The 95% confidence intervals show some slight differences, but they are roughly the same. Note: The 95% confidence intervals in StatFinale were a perfect match with the values in the cited reference.
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