Fisher and Flowerdew used a simple model to predict postoperative delirium in an older adult undergoing elective orthopedic surgery. The authors are from the University of Alberta.
Patient: age >= 60, elective orthopedic surgery
Parameters:
(1) sex
(2) clock drawing score, showing "ten minutes after 3 o'clock" on a predrawn circle
Clock Appearance
Points
hands and numbers correct
10
slight error in hands placement or 1 missing number without spacing errors
9
moderate errors in placement of hands or spacing
8
hands significantly off course and/or spacing inappropriate
7
hands used inappropriately; use of a digital display; perseveration in the writing of numbers; circling of numbers
6
numbers crowded to one side, reversed in order or missing
5
number sequence distorted; many missing numbers; numbers outside clock border; order counterclockwise
4
numbers and hands no longer connected to the drawing
3
vaguely resembles a clock
2
uninterpretable or not attempted
1
Sex
Clock Score
Odds Ratio for Postoperative Delirium
female
> 6
1
female
<= 6
4.4
male
> 6
1
male
<= 6
20.8
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