Table 2: Univariate associations between level of sleep interruption during the night of POD1 and patient and surgery characteristics.
|
Least interrupted WASO ≤ 15% (N = 94) |
Somewhat interrupted WASO 15-25% (N = 37) |
Moderately/highly interrupted WASO > 25% (N = 25) |
p-value |
Patient Characteristics |
||||
Age, % 75+ years |
66% |
62% |
80% |
0.31 |
Gender, % male |
51% |
62% |
52% |
0.51 |
Race, % White |
73% |
81% |
76% |
0.65 |
Surgery Characteristics |
||||
Surgery type, % |
||||
General |
54% |
41% |
40% |
|
Major joint |
15% |
19% |
12% |
0.42* |
Spine |
31% |
41% |
48% |
|
Surgery End Time, % 19:00 and later |
11% |
4% |
2% |
0.94* |
Surgery Duration, % 6 hours or more |
30% |
27% |
48% |
0.17 |
Postoperative Events |
||||
Postoperative pain, % ≤ 5 |
33% |
28% |
25% |
0.68 |
ICU, % admitted |
5% |
3% |
0% |
0.72* |
Sleep Characteristics |
||||
Preoperative WASO |
|
|
|
0.65* |
≤ 15% |
54% |
62% |
44% |
|
15 to 25% |
28% |
27% |
36% |
|
> 25% |
18% |
11% |
20% |
|
Preoperative daytime sleep |
|
|
|
0.64 |
≤ 20% |
24%
|
22%
|
16%
|
|
20 to 40% |
53% |
62% |
68% |
|
> 40% |
24% |
16% |
16% |
|
*Results from Fisher’s exact test
WASO: Wake After Sleep Onset; ICU: Intensive Care Unit; POD1: Post-Operative Day 1
WASO groupings are based on previously defined categories [10].