Table 2

Power for a generic binary outcome.

Year2510
Yearly rate (%)0.500.751.000.500.751.000.500.751.00
Cumulative rate (%)1.001.502.002.503.755.005.007.5010.00
n=5000.2010.2610.3170.3690.4860.5830.5830.7260.8197
n=10000.3220.4280.5210.6010.7530.8490.8490.9450.9797
n=15000.4310.5680.6770.7610.8910.9520.9520.9910.9982
n=20000.5280.680.7880.8620.9550.9860.9860.9990.9999
n=25000.6120.7670.8650.9230.9820.9960.99611
n=30000.6840.8330.9160.9580.9930.9990.99911
n=35000.7440.8820.9480.9780.9981111
n=40000.7950.9170.9690.9880.9991111
  • Rows correspond to various sample size for each device brand. Columns correspond to various yearly event rates of a generic binary event, resulting in cumulate rate at years 2, 5 and 10. Each cell denotes the power to detect an OR of 1.5. Cells colored red, white, yellow and green denote <50%, 50%–70%, 70%–90% and >90% power, respectively.