Here (/Results from R/Auxiliary/Marginal and site-specific Table 1's), you'll find a basic Table 1 for all sites combined and for each one individually. These include demographics and the proportion of subjects who had missing data on any primary outcome variable at each of the three time points. In previous multisite studies, I have sent this Table 1 to each site and asked them to give a gut check reaction to whether these tables corroborate their expectations. I'd suggest doing the same here. This helps catch any post-data-collection errors that could have arisen, including in my code.
Here (/Results from R/Auxiliary/Marginal and site-specific Table 1's), you'll find a basic Table 1 for all sites combined and for each one individually. These include demographics and the proportion of subjects who had missing data on any primary outcome variable at each of the three time points. In previous multisite studies, I have sent this Table 1 to each site and asked them to give a gut check reaction to whether these tables corroborate their expectations. I'd suggest doing the same here. This helps catch any post-data-collection errors that could have arisen, including in my code.