Table 2.
PatientCharacteristics
| Patient Characteristics | Cases (readmitted or died) N=1380 |
Controls N=2760 |
P-value |
|---|---|---|---|
| Age (years) mean | 73.25 | 73.25 | 0.94* |
| Sex | 0.97† | ||
| Female | 51% | 51% | |
| Male | 49% | 49% | |
| BMI category | |||
| BMI<20 | 6% | 5% | 0.01† |
| 20≤BMI <30 | 59% | 63% | |
| 30≤BMI<35 | 19% | 20% | |
| BMI≥35 | 15% | 12% | |
| Race | 0.17† | ||
| White | 91% | 91% | |
| Black | 6% | 5% | |
| Other | 3% | 3% | |
| Transfer Status | 0.01† | ||
| Nottransferred | 99% | 99% | |
| Transferred | 1% | 1% | |
| Emergent Status | <0.0001† | ||
| Elective | 86% | 91% | |
| Emergent | 14% | 9% | |
| APACHE Score | |||
| Mean (standard deviation) | 26.8 (8.6) | 25.4 (7.7) | <0.0001* |
| Colectomy with cancer (all) | 24% | 24% | -- |
| Left Colectomy | 7% | 7% | |
| Right Colectomy | 15% | 15% | |
| Total/Other | 2% | 2% | |
| Colectomy with out cancer (all) | 11% | 11% | -- |
| Left | 9% | 9% | |
| Right | 1% | 1% | |
| Total/Other | 1% | 1% | |
| Hip with out fracture (all) | 19% | 19% | -- |
| Total hip replacement | 14% | 14% | |
| Partial hip replacement | 2% | 2% | |
| Revision of hip replacement | 3% | 3% | |
| Knee (all) | 24% | 24% | -- |
| Total knee replacement | 22% | 22% | |
| Revision of knee replacement | 2% | 2% | |
| Thoractomy (all) | 22% | 22% | -- |
| Lobectomy | 13% | 13% | |
| Pneumonectomy | 1% | 1% | |
| Wed geresection | 8% | 8% | |
| Other‡ | 0% | 0% |
P-values compare non-obese to obese,
*
Wilcoxon’s rank sum,
†
Fisher exact test,
‡
two cases and one control underwent other thoracotomy. Patients were matched with (i) exact matching for procedure, (ii) near-exact matching and near-fine balance for hospital, and (iii) balancing the means of age and sex