Table 1.

Absolute risk reduction at fixed relative risk reduction. The degree of reduction in absolute risk following an intervention is highly dependent on the prior risk in that individual.

Absolute risk in controls	Number of events in 1000 controls	Number of events in 1000 treated	Relative risk reduction	Absolute risk reduction
40%	400	280	30%	12%
20%	200	140	30%	6%
10%	100	70	30%	3%
1%	10	7	30%	0.3%