With the new PLS , more participants understood the benefits and harms and quality of evidence ( 53 % vs. 18 % , P < 0.001 ) ; more answered each of the five questions correctly ( P 0.001 for four questions ) ; and they answered more questions correctly , median 3 ( interquartile range [ IQR ] : 1-4 ) vs. 1 ( IQR : 0-1 ) , P < 0.001 ) .