Doesn't seem like very strong data.

First off, covid does not cause schizophrenia. From the study: " our results did not support a causal effect of SARS-CoV-2 infection on this psychiatric disease."

Second, they only associate hospitalization of covid with schizophrenia. It's not controlled though, so perhaps other confounders that cause covid hospitalization also cause schizophrenia (like poor self care, poor hygiene, smoking, etc). Its not far fetched to think that those who are more likely to be hospitalized are more likely to get mentally ill.

Lastly, the effect was an 11% increased risk of schizophrenia. So if .4% is the odds of getting schizophrenia, covid hospitalization increases the risk to .44%, or a .04% increase. And covid hospitalization is easily preventable with vaccines and self care.

In summary: covid doesn't cause schizophrenia. People who get hospitalized with covid are more likely to get schizophrenia. Good chance of confounders, like smoking or poor self care. Nothing to be concerned about.

Some interesting observations:

Age was looked at >60 and <60. I'm more interested in younger cohorts as many studies show low occurrence of long covid amongst the young, especially kids.

It's looking at relative risk. 19% lower relative risk when converted to absolute risk isn't as scary. For example CDC quoted 7.5% of people get long covid. So vaccine may reduce the 7.5% to 6%. (This isnt fully accurate, we would need to look at vaccinated vs unvaccinated)

I want to see more controlled studies on long covid controlled for people with psychological disorders, health issues, and age.

But overall this is just more data showing the benefits of the vaccine.