Table 2.

Sample size calculations for detection of reductions in error rate

Risk ratio	Power (%)	Sample size (total)
0.6	80	3,210
0.7	80	5,940*
0.8	80	13,888
0.6	90	4,230
0.7	90	7,862
0.8	90	18,456

*Similar to proposed sample in this study.

Sample size calculations for detection of reductions in error rate; baseline error rate 5% and other assumptions, as in Table 1.