Fig. 3. Length of hospital stay. Group 1, nonperforation; group 2, perforation identified pathologically but not surgically; group 3, perforation identified surgically but not pathologically; group 4, perforation identified both pathologically and surgically. The middle lines in the boxes denote medians, and the upper and lower margins in the boxes represent the upper and lower quartiles, respectively. The ends of the vertical lines indicate 1.5 times the interquartile range. The crosses indicate outliers.
