In the upper two standard deviation approach, when you employ SPSS to compute the standard deviation of a set of scores, the way to determine whether your treatment mean is significantly better than the baseline mean is:

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With the upper two standard deviation approach, you want to determine whether your treatment mean is significantly better than the baseline mean. To do this, you need to compute the baseline mean and the treatment mean. Then you double the standard deviation and add it or subtract it (as indicated by the nature of the change desired in the outcome variable) from your baseline mean to determine whether your treatment mean is significantly better than the baseline mean. This approach is based on the assumption that if the treatment mean is more than two standard deviations away from the baseline mean, the difference is statistically significant.

In the Upper Two Standard Deviation Approach, When You Employ