Table 5 Example of Confounding by Study.
From: Meta-analytic methods for pooling rates when follow-up duration varies: a case study
| Â | Control | Treated | Â | ||||
|---|---|---|---|---|---|---|---|
Study | Events | Person-time | Rate | Events | Person-time | Rate | Relative Rate |
1 | 10 | 100 | 0.10 | 5 | 100 | 0.05 | 0.50 |
2 | 40 | 100 | 0.40 | 5 | 25 | 0.20 | 0.50 |
Total (ignoring "study") | 50 | 200 | 0.25 | 10 | 125 | 0.08 | 0.32 |