Table 3.  Baseline characteristics of the study population by 30 day readmission status
Characteristic
Entire
Cohort
n = 1781
Not readmitted within 30 days
n = 1325
Readmitted within 30 days
n = 456
p value
Age, mean (SD)
63 (16)
63 (16)
64 (15.5)
0.166
Female
840 (47%)
624 (47%)
216 (47%)
0.919
Length of stay (SD)
8 (7.6)
7.7 (7.1)
8.4 (8.8)
0.088
Hospital admissions in the last year(SD)
0.94 (1.2)
0.71 (0.8)
1.61 (1.7)
<0.001
Emergency department visits in last 6 months (SD)
0.60 (1.9)
0.39 (1.22)
1.21 (3.0)
<0.001
Emergency department visits in last year months (SD)
1.2 (2.96)
0.78 (2.02)
2.25 (4.57)
<0.001
 
 
 
 
 
HOSPITAL Score (SD)
4.14 (1.61)
3.86 (1.4)
4.96 (1.8)
<0.001
LACE Index (SD)
10.32 (3.42)
9.92 (3.0)
11.47 (4.1)
<0.001
 
 
 
 
 
Any vital sign instability
228 (13%)
159 (12%)
69 (15%)
0.084
   1 vital sign unstable
206 (12%)
140 (11%)
66 (14%)
0.024
   2 vital signs unstable
22 (1%)
19 (1%)
3 (0.1%)
0.196
   3 or more vital signs unstable
0 (0%)
0 (0%)
0 (0%)
 
 
 
 
 
 
Unstable vital sign at  discharge
 
 
 
 
   Temperature 37.8˚C
3 (0.2%)
1 (0.1%)
2 (0.4%)
0.103
   Respiratory rate > 24 breaths/minute
49 (3%)
37 (2.7%)
12 (2.6%)
0.856
   Heart rate > 100 beats/minute
168 (9%)
117 (8.8%)
51 (11.2%)
0.138
   Systolic blood pressure <90 mmHg
21 (1%)
14 (1.1%)
7 (1.5%)
0.414
   Oxygen saturation <90%
9 (0.5%)
9 (0.7%)
0 (0%)
0.078