Relative risk (RR) Effect on risk

0.25

75% reduction in risk

0.5

50% reduction in risk

1.0

No effect

1.5

50% increase in risk

2.0

100% (or two-fold) increase in risk

Relative risk (RR) Effect on risk

0.25

75% reduction in risk

0.5

50% reduction in risk

1.0

No effect

1.5

50% increase in risk

2.0

100% (or two-fold) increase in risk

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