Yes it was a 5year study and used the NIH baselone of 20 ng/mL. More recent observational study using 50 ng/mL showed a much higher effect. It's not your RCT but it's a very well organized study that when I posted you completely ignored or dismissed.
I do dismiss observational studies for Vitamin D because they have many times in the past shown strong positives that have turned out incorrect.
There is a reason: Vitamin D correlates with good health in many different ways (and its lack with illness) it is difficult to separate out all those factors in an observational study.