> Massive confounding factor here is that starting around April seasonality … was putting massive downward pressure on the epidemic. That’s wrong, the opposite

> Massive confounding factor here is that starting around April seasonality … was putting massive downward pressure on the epidemic. That’s wrong, the opposite is the case. The study controls for this by looking at a synthetic control over the same time period, which consists of other populations without mandatory mask-wearing. It’s an observational study so it can’t control for everything but it does control for seasonality, even if “seasonality” isn’t specifically mentioned in the paper.