Marilyn Oermann, professor, published an article entitled "Training Interval in Cardiopulmonary Resuscitation" in the journal PLOS One.

Although evidence supports brief, frequent CPR training, optimal training intervals have not been established. The purpose of this study was to compare nursing students’ CPR skills (compressions and ventilations) with 4 different spaced training intervals: daily, weekly, monthly, and quarterly, each for 4 times in a row.