Figure 2. Boxplot graphical comparison of fluoroscopy time and dose–area product between three operators (p<0.001 between operator 3 and others). Operator 1 is on the left, operator 2 is in the middle and operator 3 is on the right. Boxplot explanation: upper horizontal line of box, 75th percentile; lower horizontal line of box, 25th percentile; horizontal bar within box, median; upper horizontal bar outside box, 90th percentile; lower horizontal bar outside box, 10th percentile. Open circles (O) represent values more than 1.5 box-lengths from 75th percentile (outliers). Asterisks (*) represent values more than 3 box-lengths from 75th percentile (extremes).