Table 1. Characteristics of study sample of discharges ≥60 y with principal diagnosis as AD and at least one procedure performed by procedure group; NIS 2002–2012.
| All (2002–2012) | Non-AD only | AD | p-value* | |
|---|---|---|---|---|
| Weighted N | 92,300 | 47,850 | 44,449 | |
| Patient-level characteristics | ||||
| Age, y (Mean±SE) | 81.1 ± 0.1 | 81.7 ± 0.1 | 80.4 ± 0.1 | <0.001 |
| Female, (%±SE) | 57.6 ± 0.5 | 57.0 ± 0.5 | 58.2 ± 0.8 | 0.20 |
| Race, (%±SE)† | 0.006 | |||
| White | 73.9 ± 1.3 | 75.4 ± 1.0 | 72.3 ± 2.2 | |
| Black | 14.4 ± 0.7 | 14.6 ± 0.8 | 14.2 ± 1.0 | |
| Hispanic | 6.4 ± 0.6 | 6.1 ± 0.6 | 6.6 ± 0.8 | |
| Asian | 0.9 ± 0.1 | 0.8 ± 0.1 | 1.1 ± 0.2 | |
| Native American | 0.5 ± 0.2 | 0.6 ± 0.3 | 0.3 ± 0.1 | |
| Other | 4.0 ± 1.0 | 2.4 ± 0.3 | 5.6 ± 0.2 | |
| Income quartiles, (%±SE) | ||||
| I | 27.1 ± 1.3 | 27.5 ± 1.0 | 26.6 ± 2.3 | 0.11 |
| II | 23.5 ± 0.7 | 24.3 ± 0.7 | 22.6 ± 1.1 | |
| III | 23.2 ± 0.7 | 24.1 ± 0.7 | 22.2 ± 1.1 | |
| IV | 26.3 ± 0.1 | 24.2 ± 1.1 | 28.6 ± 2.0 | |
| Insurance status, (%±SE) | ||||
| Medicare | 90.9 ± 0.6 | 92.0 ± 0.4 | 89.8 ± 1.2 | 0.042 |
| Medicaid | 2.0 ± 0.3 | 1.4 ± 0.2 | 2.6 ± 0.5 | |
| Private insurance | 5.5 ± 0.2 | 5.3 ± 0.3 | 5.8 ± 0.5 | |
| Self-pay | 0.8 0.2 | 0.6 0.1 | 0.9 0.4 | |
| No charge | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | |
| Other | 0.8 ± 0.1 | 0.7 ± 0.1 | 0.9 ± 0.2 | |
| Admission day | ||||
| Weekday | 81.6 ± 0.4 | 80.7 ± 0.4 | 82.6 ± 0.7 | 0.018 |
| Weekend | 18.4 ± 0.4 | 19.3 ± 0.4 | 17.4 ± 0.7 | |
| Total co-morbidities (0–27) | 2.45 ± 0.02 | 2.63 ± 0.02 | 2.25 ± 0.04 | <0.001 |
| Charlson co-morbidity index | <0.001 | |||
| 0 | 44.5 ± 0.5 | 41.8 ± 0.6 | 47.5 ± 0.9 | |
| 1 | 27.9 ± 0.4 | 27.1 ± 0.5 | 28.9 ± 0.5 | |
| 2 | 27.5 ± 0.5 | 31.1 ± 0.5 | 24.0 ± 0.9 | |
| Hospital-level characteristics | ||||
| Region of Hospital | ||||
| Northeast | 32.0 1.9 | 27.3 1.7 | 37.0 3.2 | 0.004 |
| Midwest | 20.7 ± 1.7 | 22.5 ± 1.2 | 18.6±3.2 | |
| South | 34.5 ± 1.8 | 39.1 ± 1.6 | 29.6 ±3.0 | |
| West | 12.9 1.3 | 11.1 0.8 | 14.8 2.3 | |
| Bed Size | ||||
| Small | 13.5 ± 1.5 | 12.9 ± 1.0 | 14.1 ± 2.6 | 0.84 |
| Medium | 29.5 ± 1.7 | 29.2 ± 1.7 | 29.8 ± 2.9 | |
| Large | 57.0 ± 2.0 | 57.8 ± 1.7 | 56.1 ± 3.4 | |
| Location/teaching status | ||||
| Rural | 14.1 ± 1.7 | 14.9 ± 1.1 | 13.3 ± 3.1 | 0.039 |
| Urban, non-teaching | 41.7 ± 1.9 | 45.9 ± 1.7 | 37.3 ± 3.2 | |
| Urban, teaching | 44.1 ± 2.0 | 39.2 ± 1.6 | 49.4 ± 3.4 | |
*
Based on design-based F-test from linear regression models for continuous characteristics with procedure group as the predictor or design-based F-test from a cross-tabulation of two categorical variables (categorical characteristic and procedure group).
†
Data was available on a Weighted N of 75,839 of the 92,300 for the race variable. All other variables had <5% missing data.