lowwhe.blogg.se - How to do odds ratios with 4 groups on spss on mac

Total number of cases: a variable containing the total number of cases in the intervention groups of the different studies.

Studies: a variable containing an identification of the different studies. The dialog box for "Meta-analysis: odds ratio" can then be completed as follows: On the next rows of the spreadsheet follow the data of 4 other studies.

23 cases received a placebo and 3 of these had a positive outcome.

In this example, in a first study 73 cases were treated with an active substance and of these, 15 had a positive outcome. The data of different studies can be entered as follows in the spreadsheet: Next the heterogeneity statistic is incorporated to calculate the summary odds ratio under the random effects model (DerSimonian & Laird, 1986). MedCalc uses the Mantel-Haenszel method (Mantel & Haenszel, 1959) for calculating the weighted pooled odds ratio under the fixed effects model. For a short overview of meta-analysis in MedCalc, see Meta-analysis: introduction.