Table 2.

Sample size required to attain 95% and 75% power to detect a difference of 0.7

	Sample size required
Standard deviation on log-scale	95% Power	75% Power
0.6	12	8
0.7	16	10
0.8	20	12
0.9	24	14
1.0	29	17
1.1	35	20
1.2	41	23
1.3	47	26
1.4	54	30