Table 4.

Power calculations for the HBV study.

Allele Frequency	(n = 400 cases, 400 controls)
Odds Ratio = 1.5	% Power, alpha≤ 0.05
0.01	09
0.05	27
0.1	45
0.2	67
0.5	81
Odds Ratio = 2
0.01	20
0.05	69
0.1	91
0.2	99
0.5	99