That’s an interesting point, I can’t say I recall what type of analysis if any was performed to address something like this. With that said, while these types o

That’s an interesting point, I can’t say I recall what type of analysis if any was performed to address something like this. With that said, while these types of selection biases probably make it challenging to reliably estimate absolute drug usage rates, I would imagine they are less impactful on the relative rates between demos of geographical areas, which is the quantity of interest here.