Table 1.
Descriptive statistics of patient population across study time periods
| Variable | Period 1 | Period 2 | Period 3 | P value | |
|---|---|---|---|---|---|
| Age (years) |
Mean (SD) |
53.6 (19.1) |
53.6 (19.1) |
54.0 (18.9) |
<0.01 |
| Sex |
Female |
40,333 (57.4%) |
58,506 (57.1%) |
28,799 (57.2%) |
0.56 |
| Race |
White |
38,317 (54.5%) |
56,095 (54.8%) |
27,039 (53.7%) |
<0.01 |
| |
Other |
31,547 (44.9%) |
45,984 (44.9%) |
23,109 (45.9%) |
|
| |
Unknown |
419 (0.6%) |
329 (0.3%) |
223 (0.4%) |
|
| Health Insurance |
Self Pay |
841 (1.2%) |
1,258 (1.2%) |
501 (1.0%) |
<0.01 |
| |
Insured |
65,246 (92.8%) |
99,895 (97.5%) |
49,307 (97.9%) |
|
| |
Unknown |
4,196 (6.0%) |
1,255 (1.2%) |
563 (1.1%) |
|
| Weight (kg) |
Mean (SD) |
82.3 (24.0) |
82.8 (24.1) |
82.8 (24.1) |
<0.01 |
| CrCl <30 |
Yes |
5,159 (9.7%) |
7,547 (9.9%) |
3,828 (8.8%) |
<0.01 |
| |
No |
47,855 (90.3%) |
68,743 (90.1%) |
39,513 (91.2%) |
|
| Length of Stay (days) |
Mean (SD) |
5.2 (7.7) |
5.1 (7.6) |
5.2 (7.0) |
<0.01 |
| DRG Weight |
Mean (SD) |
1.7 (1.9) |
1.7 (1.9) |
1.7 (2.0) |
<0.01 |
| Discharging Unit |
Medicine |
2,488 (46.2%) |
47,973 (46.8%) |
24,373 (48.4%) |
<0.01 |
| |
Ortho/Trauma |
7,657 (10.9%) |
11,506 (11.2%) |
5,825 (11.6%) |
|
| |
Other Surgery |
30,138 (42.9%) |
42,929 (41.9%) |
20,173 (40.0%) |
|
| Top 5 Primary Discharge Diagnoses |
First |
Device complications 2,856 (4.4%) |
Device complications 4,423 (4.5%) |
Device complications 2,355 (4.8%) |
NA |
| |
Second |
Osteoarthritis 2,327 (3.6%) |
Osteoarthritis 3,505 (3.5%) |
Osteoarthritis 1,805 (3.7%) |
|
| |
Third |
CAD 2,104 (3.3%) |
CAD 3,342 (3.4%) |
Dysrhythmia 1,676 (3.5%) |
|
| |
Fourth |
CHF 1,971 (3.0%) |
Dysrhythmia 3,321 (3.4%) |
CHF 1,460 (3.0%) |
|
| Fifth | Dysrhythmia 1,940 (3.0%) | Birth complications 2,935 (3.0%) | CAD 1,419 (2.9%) |
Abbreviations: CAD, coronary artery disease; CHF, congestive heart failure; CrCl, creatinine clearance; DRG, diagnosis-related group; SD, standard deviation.