Fig. 3

Time distance calculated according to the geographical movement of physicians every 2 years since registration. This figure shows time distance at 2-year intervals after registration up to 14 years (from the left to right). The dots represent median values; the upper lines of the boxes represent the 75th percentile, and the bottom lines represent the 25th percentile. We calculated these values from all samples, which numbered 122 150. The median values of time distance for every 2 years since registration up to 14 years registered at 0, except for 0 to 2 years (27 min), 2 to 4 years (37 min), 4 to 6 years (30 min), and 6 to 8 years (13 min). The median values for those four periods were significantly different (p < 0.05)