Table 1.

Sample size per group for 80% power, α=0.05

		Event rate in more intensive surveillance group
		25%	30%	35%	40%
Event rate in less intensive surveillance group	35%	696	2832	–	–
	40%	332	752	3020	–
	45%	196	352	792	3148
	50%	132	204	368	816
	55%	96	136	212	372

Event rate=death