Fig. 4From: Using Lean Six Sigma techniques to improve efficiency in outpatient ophthalmology clinicsDistribution of patient in-clinic time pre- and post-implementation. Comparing pre- (Fig. 4a) to post-implementation (Fig. 4b), patient in-clinic time significantly decreased as shown through a left-shift in the distribution of in-clinic time post-implementation. IQR: interquartile rangeBack to article page