Do you have any sources for that empirical result? I saw a big study result from Africa that came out last week, and it showed that surgical masks were helpful

Do you have any sources for that empirical result? I saw a big study result from Africa that came out last week, and it showed that surgical masks were helpful in reducing spread but the p-values were surprisingly weak except in the over-65 group. And cloth masks were very statistically weak in helping anyone.