Table 2.

Power to detect difference in intradialytic hypotension (IDH) rates. The power is shown to detect a difference in IDH rates (D) between groups with at least (k) number of facilities, assuming 2 possible SDs (sigma).

Detectable IDH rate difference, D	SD, sigma	Number of facilities, k	Power, %
0.034	0.08	10	80
0.034	0.10	10	61
0.040	0.08	10	91
0.043	0.10	10	81