Clinical perspective, offered as context rather than as advice. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

The figures, for anyone assembling their own picture. If you are going to change something, change one thing and give it long enough to express itself. Four weeks is the usual minimum for anything pharmacological on this board, and two weeks of data has told you almost nothing.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

A narrower follow-up, since the general answer is now clear:

What would you measure differently if you were starting again?

raj_cambridge said:

If you are going to change something, change one thing and give it long enough to express itself.

Worth saying that the confident version of this is more useful to the person writing it than to the person reading it.

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful.