Question 1: How should we put in the data from the BMJ graph?
We first need to put in the study names. Click "Insert" "Column for" "Study names". Type the names in the column.
We next put in the data. Click "Insert" "Column for" "Effect size data". A dialogue box appears. Click "Next". We have two groups, endarterectomy and stenting, so click the button for "Comparison of two groups ...", click "Next". Our data are dichotomous, so click that, and unmatched and prospective, so click that. We have number of events and sample size in each group, so click that. We are ready to go, so click "Finish".
You can put in the names for the two groups, "Endarterectomy" and "Stenting", but CMA2 does not seem to use them for anything. Now put in the data for each study.
You should see something like this:
| Study name | Endarterectomy Events | Endarterectomy Total N | Stenting Events | Stenting Total N | Odds ratio | Log odds ratio | Std Err | I | J |
|---|---|---|---|---|---|---|---|---|---|
| Naylor 1998 | 0 | 12 | 5 | 11 | 0.047 | –3.052 | 1.554 | ||
| Wallstent 2001 | 5 | 112 | 13 | 107 | 0.338 | –1.085 | 0.545 | ||
| CAVATAS 2001 | 25 | 253 | 25 | 251 | 0.991 | –0.009 | 0.298 | ||
| Brooks 2001 | 1 | 51 | 0 | 53 | 3.178 | 1.156 | 1.645 | ||
| Brooks 2004 | 0 | 42 | 0 | 43 | |||||
| SAPPHIRE 2004 | 8 | 167 | 7 | 167 | 1.150 | 0.140 | 0.530 | ||
| EVA-3S 2006 | 10 | 262 | 25 | 265 | 0.381 | –0.965 | 0.385 | ||
| SPACE 2006 | 38 | 584 | 46 | 599 | 0.837 | –0.178 | 0.227 | ||
| BACASS 2007 | 1 | 10 | 0 | 10 | 3.316 | 1.199 | 1.693 | ||
| ICSS 2009 | 43 | 857 | 72 | 853 | 0.573 | –0.557 | 0.199 |
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Last updated: 19 February, 2010.