Bravada International Ltd (BRAV)

[Jammin1]

Keep in mind that there are many factors at play in any study like this.
A 1.2% reduction in what? New case rate? Existing cases?
What's the control? If no masks had been used, would cases have gone up 50% instead? Or 400% perhaps? You need a comparison.

You also have to look at cause and effect. Places with higher population densities naturally had faster spread, which lead to more mask wearing. Places with very low population densities could get away with lower mask wearing, so they did, and you can point to that and say "see, less mask wearing and less cases", but there are outside factors affecting both and correlating them.

To truly see the effects, you'd need places with similar densities, similar habits, and similar case loads, but one with more masks than the other. Those comparisons are hard to find.