The number of treatment units (subjects or groups of subjects) assigned to control and treatment groups, affects an RCT's reliability. If the effect of the treatment is small, the number of treatment units in either group may be insufficient for rejecting the null hypothesis in the respective statistical test . The failure to reject the null hypothesis would imply that the treatment shows no statistically significant effect on the treated in a given test . But as the sample size increases, the same RCT may be able to demonstrate a significant effect of the treatment, even if this effect is small. 
The derivatives of testosterone’s are called anabolics. This is when a testosterone is changed in a way that only keeps some of its original characteristics buts excludes others. For example a anabolic steroid could have muscle building effects but without the water retention of the original testosterone it got derived from. These variations are endless and a science on its own. We will discuss and explain every characteristic of every anabolic steroid in depth so that athletes would know what is best for them because we all have different needs.