Table 3: Univariate associations between level of daytime sleep on POD1 and patient and surgery characteristics.
|
Daytime inactivity/sleep ≤ 20% (N = 11) |
Daytime inactivity/sleep 20% to 40% (N = 43) |
Daytime inactivity/sleep > 40% (N = 102) |
p-value |
Patient Characteristics |
||||
Age, % 75+ years |
64% |
58% |
72% |
0.30* |
Gender, % male |
64% |
56% |
52% |
0.73 |
Race, % White |
55% |
86% |
74% |
0.07* |
Surgery Characteristics |
||||
Surgery type, % |
|
|
|
|
General |
27% |
35% |
57% |
|
Major joint |
45% |
21% |
10% |
0.01* |
Spine |
27% |
44% |
33% |
|
Surgery End Time, % 19:00 and later |
18% |
2% |
14% |
0.06* |
Surgery Duration, % 6 hours or more |
27% |
18% |
38% |
0.07* |
Postoperative Events |
||||
Postoperative pain, % ≤ 5 |
27% |
35% |
29% |
0.77* |
ICU, % admitted |
0% |
0% |
6% |
0.27* |
Sleep Characteristics |
||||
Preoperative WASO |
|
|
|
0.25* |
≤ 15% |
45% |
51% |
57% |
|
15 to 25% |
27% |
40% |
25% |
|
> 25% |
27% |
9% |
19% |
|
Preoperative daytime sleep |
|
|
|
0.41* |
≤ 20% |
36% |
28% |
18% |
|
20 to 40% |
55% |
56% |
58% |
|
> 40% |
9% |
16% |
24% |
|
*Results from Fisher’s exact test
WASO: Wake After Sleep Onset; ICU: Intensive Care Unit; POD1: Postoperative Day 1
Daytime inactivity groupings are based on the frequency distribution of daytime inactivity for our cohort.