Table 1:

Estimated sample sizes for 80% or 90% power at the 2-sided 5% significance level to detect specific yearly rates of WBNAA change using K equally spaced annual scans

Yearly WBNAA Rate of Change (%)	80% Power		90% Power
Yearly WBNAA Rate of Change (%)	K = 4	K = 6	K = 4	K = 6
2	207	104	276	139
4	54	28	71	37
6	25	14	33	18
8	15	9	20	11
10	11	7	14	8