Specifically, examine the following:

“In the cross-sectional analysis, both statins and nonstatin cholesterol-lowering drugs were associated with PD (that is, predictive of the probability associated with having PD), but in the lagged case-control analysis of treatment duration, only statins remained significantly associated with THE PROBABILITY OF PD risk.

The highest risk was linked to the earlier period after starting statins (OR, 1.93 for less than 1 year of use; 1.83 for 1 to 2.5 years; and 1.37 for 2.5 years or more; P trend < .0001).”

What is the IV (Predictor) in this study?

What is the DV in this study?

What is the odds ratio found in this study for less than one year of use?

What does this odds ration tell us about the relationship between the IV and the DV?