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

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