Hello all,

I'm conducting a power analysis(t-test) for a randomized controlled trial(blinded one) comparing two independent groups.

I plan to use block randomization, and I know the block size should be a multiple of the number of groups (e.g., with 2 treatment groups, block size of either 4 or 6 or 8, ...), but I am not sure which one should I use 4 or 6 ?

any input appreciated,

Bahar