1. RR | 0.46 | 0.70 | 0.50 | 0.63 |
2. log (RR)* | −0.7765 (E1) | −0.3567 (E2) | −0.6931 (E1) | −0.4620 (E2) |
3. SE (log (RR))† | 0.4081 | 0.1692 | 0.3598 | 0.2178 |
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Difference between the logarithms of relative risks:
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4. d ( = E1– E2) | −0.4198 | −0.2311 |
5. SE (d) | = √(0.40812+0.16922) = 0.4419 | 0.4206 |
6. CI (d)‡ | = −0.4198±1.96×0.4419, or: | −1.0555 to 0.5933 |
−1.2859 to 0.4463 |
7. Test of interaction | z = −0.4198/0.4419 = 0.95 (p = 0.17) | z = −0.55 (p = 0.29) |
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Ratio of relative risks (ratio):
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8. Ratio = exp(d) | = exp (−0.4198) = 0.66 | 0.79 |
9. CI (ratio) | = exp (−1.2859) to exp(0.4463), or: | 0.35 to 1.81 |
0.28 to 1.56 |