**Figure 3:** Box plots for the mean number of hours billed per day for each British Columbia anesthesiologist, in each year
of the study, stratified by age groups. The dark solid line represents the median among all physicians for that year, and
the upper and lower lines of the box represent the 25^{th} and 75^{th} percentiles. The lines extending from the boxes show
the range 1.5 times the interquartile range (IQR) or stop at the maximum value if this is less than 1.5 times the IQR.
Outlying data points are shown as circles. |