Suicide rate increases during the week of a full moon

It seems a bit strange that the dataset used is “suicides from the Marion County Coroner’s Office (n = 776)” when the hypothesis is a correlation between two things where so much public data must be available. It kind of makes you suspect that a larger dataset might have been avoided since it would have shown no correlation?

Study:

https://link.springer.com/article/10.1007/s44192-023-00035-4