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Figure 19. Decision tree for length of stay
The first split occurs based upon the value of septicemia; if the value is equal to one, then the average
length of stay is predicted to be almost 12 days.
IF immune < 0.5
AND 0.5 <= Died during hospitalization
AND septicemia < 0.5
THEN
NODE: 8
N: 306
AVE: 7.8268
SD: 13.8321
IF 0.5 <= immune
AND 0.5 <= Died during hospitalization
AND septicemia < 0.5
THEN
NODE: 9
N: 196
AVE: 10.6837
SD: 15.0706
The second split occurs for a value of immune disorder and mortality. If the patient died, the value
of septicemia is positive and the value of immune disorder is negative, then the average length of stay is
almost 8 days; if immune disorder is positive and the patient died (and has septicemia), then the average
length of stay is almost 11 days.
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