Authors controlled for age, sex. But I'd like to see additional control for race. Black people have less Vitamin D due to melanin blocking sunlight. And black people are disproportionately impacted by COVID.
So I'm now curious whether it's really Vitamin D deficiency that's causing the poor outcomes, or some racial socioeconomic factor that Vitamin D is simply a marker for.
So I'm now curious whether it's really Vitamin D deficiency that's causing the poor outcomes, or some racial socioeconomic factor that Vitamin D is simply a marker for.