To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.
Bought this for my husband as he was starting his nurse training. Found the book at times too technical but it is a great reference book. As a nurse myself for many years I wish I had bought this earlier.