Table 1.
Demographics of the NIS sample
| Variable | Patients n = 84,206 |
Percentage |
|---|---|---|
| Mean age (years) | 68.8 | |
| Patients ≤ 55 years old | 10,548 | 12.5% |
| Patients > 55 years old | 73,514 | 87.5% |
| Male sex | 33,458 | 39.7% |
| Ethnicity | ||
| Caucasian | 56,741 | 67.4% |
| Black | 2549 | 3.0% |
| Hispanic | 2400 | 2.9% |
| Asian | 447 | 0.5% |
| Native American | 223 | 0.3% |
| Other/unknown* | 22,069 | 26.2% |
| Geographic location | ||
| Northeast | 9860 | 11.7% |
| Midwest | 23,878 | 28.4% |
| South | 30,585 | 36.3% |
| West | 19,883 | 23.6% |
| Practice size | ||
| Small | 13,030 | 15.5% |
| Medium | 19,536 | 23.2% |
| Large | 51,180 | 60.8% |
NIS = National Inpatient Sample; * = other or unknown listing in NIS database without further clarification available.