Table 5 |
|||||||
|
Example of Confounding by Study. |
|||||||
|
Control |
Treated |
||||||
|
|
|||||||
|
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 |
|
|
|||||||
|
Guevara et al. BMC Medical Research Methodology 2004 4:17 doi:10.1186/1471-2288-4-17 |
|||||||
