Table II.
Comparisons of inpatients vs. outpatients by demographic, comorbidity, laboratory, and perioperative characteristics among the early cohort (2005-2016) and the late cohort (2017-2019).
| Demographic, comorbidity, or laboratory characteristic | Early |
Late |
||||
|---|---|---|---|---|---|---|
| Inpatient (n = 12,047) | Outpatient (n = 354) | P value | Inpatient (n = 11,688) | Outpatient (n = 1157) | P value | |
| Age | <.001 | <.001 | ||||
| 18-59 | 14.9% | 28.8% | 12.9% | 17.5% | ||
| 60-69 | 33.6% | 34.2% | 33.5% | 37.7% | ||
| ≥70 | 51.5% | 37.0% | 53.6% | 44.9% | ||
| Sex | <.001 | <.001 | ||||
| Male | 43.5% | 53.1% | 43.6% | 54.5% | ||
| Female | 56.6% | 46.9% | 56.5% | 45.6% | ||
| Body mass index | .002 | <.001 | ||||
| ≤25 | 17.2% | 20.6% | 16.4% | 19.5% | ||
| 25-30 | 32.4% | 37.0% | 31.3% | 36.2% | ||
| 30-35 | 26.1% | 26.6% | 26.7% | 26.9% | ||
| ≥35 | 24.2% | 15.8% | 25.7% | 17.4% | ||
| Diabetes mellitus | .035 | <.001 | ||||
| No diabetes mellitus | 82.8% | 87.3% | 81.7% | 86.8% | ||
| NIDDM | 12.2% | 10.5% | 13.2% | 9.8% | ||
| IDDM | 4.9% | 2.3% | 5.2% | 3.5% | ||
| Dyspnea on exertion | 7.0% | 1.1% | <.001 | 7.2% | 2.2% | <.001 |
| Hypertension | 67.6% | 55.7% | <.001 | 68.3% | 58.3% | <.001 |
| COPD | 6.3% | 4.2% | .109 | 7.2% | 2.9% | <.001 |
| Current smoker | 10.5% | 11.3% | .626 | 10.5% | 8.2% | .013 |
| Anemia∗ | 24.1% | 20.9% | .167 | 22.6% | 16.8% | <.001 |
| Serum albumin | .505 | <.001 | ||||
| Normal (≥3.5 g/dL) | 42.8% | 42.7% | 50.7% | 41.2% | ||
| Hypoalbuminemia (<3.5 g/dL) | 3.0% | 2.0% | 3.5% | 1.6% | ||
| Albumin level not available | 54.1% | 55.4% | 45.9% | 57.2% | ||
NIDDM, noninsulin-dependent diabetes mellitus; IDDM, insulin-dependent diabetes mellitus; COPD, chronic obstructive pulmonary disease.
Bold indicates statistical significance (P < .05).
∗
Anemia was defined as preoperative hematocrit below 36 for women or 41 for men.