How to set up an analysis

1. Create an analysis group

To set up an analysis group (formerly called 'comparison'), click on the '+Add Analysis Group' button in the 'Analyses' section.

2. Name the analysis group

Click on the 'Edit Analysis Group' button and enter the name of the new analysis group. Note: you cannot set labels for the intervention groups and graph labels until you add an analysis for this analysis group. After you add an analysis (previously called 'outcome'), go back to the 'Analyses' section, open the newly ceated analysis group, click on the 'Edit Analysis Group' link and set the graph and group labels for all analyses under this analysis group. Note: you need to click on the 'Set Labels' buttons to save the label names.

Click on the 'Back to Analyses' link to return to the list of comparisons.

3. Create an analysis

Click on the plus icon to the right-hand side of an analysis group to create a new analysis. You can also do that by clicking on the '+Add Analysis' button when you are in the analysis group.

4. Name the analysis

Type in the name of the analysis. (Now you can go back and set the labels for the intervention groups and graph labels – see point 2 above.)

5. Set the analysis options

Click on the 'Options' tab to choose the options for meta-analysis and display of results. Note: you can only change the data type (e.g. dichotomous to continuous) while you are editing the analysis for the first time. When you close the analysis, you cannot change the data type.

Under the ‘Options’ tab you can also select the statistical method, effect measure, analysis model, and how you want to display the results. If you are doing a subgroup analysis, the test for subgroup differences is checked by default. You can swap event and non-event and change the confidence intervals.

6. Add studies and study data

Once you have selected the analysis options, go back to the 'Data' tab and click on the '+Add Data Row' button to add a study from the list of included studies. You can then enter the data into the table. 

You can delete a data row by clicking on the 'Action' button to the right and selecting 'Delete Data Row'.

7. Adjust how the forest plot is displayed

Once you have entered the data for the studies included in the analysis, click on the 'Graphs' tab to adjust the forest plot. By default, the scale is set to 100 and you can change that to optimize the presentation of your results. The Risk of Bias summary is also displayed by default, but you can remove it by unchecking the 'Show Risk of bias summary' box. You can sort the studies by study ID, year of study, weight, effect size, or risk of bias item.