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