Additional file 2: Table S1. of Sample size and power determination when limited preliminary information is available

Sample sizes needed per group for a two-sided two group t-test of equal means assuming a significance level of 0.05 or 0.01, power of 80% or 90%, correlation coefficient between pre and post-treatment values of 0.50 for each DOSI measure, and equal sample sizes per group*. Table S2. Sample sizes needed per group for a two-sided two group t-test of equal means assuming a significance level of 0.05 or 0.01, power of 80% or 90%, correlation coefficient between pre and post-treatment values of 0.80 for each DOSI measure, and equal sample sizes per group. Table S3. Sample sizes needed per group for a two-sided two group t-test of equal means assuming a significance level of 0.05 or 0.01, power of 80% or 90%, correlation coefficient between pre and post-treatment values of 0.90 for each DOSI measure, and equal sample sizes per group. (DOC 109 kb