Table 1.
Patient Characteristics, Overall Cohort (N=92,436) and for Model Training Sample (N=46,218) and Model Validation Sample (N=46,218)
| Characteristic | Overall Cohort N (%) |
Training Sample N (%) |
Validation Sample N (%) |
|---|---|---|---|
| Age Group | |||
| 66–69 | 16,138 (17.5) | 8,040 (17.4) | 8,098 (17.5) |
| 70–74 | 21,795 (23.6) | 10,957 (23.7) | 10,838 (23.5) |
| 75–79 | 21,668 (23.4) | 10,848 (23.5) | 10,820 (23.4) |
| 80+ | 32,835 (35.5) | 16,373 (35.4) | 16,462 (35.6) |
| Sex | |||
| Female | 56,510 (61.1) | 28,258 (61.1) | 28, 252 (61.1) |
| Race | |||
| White | 80,884 (87.5) | 40, 473 (87.6) | 40,411 (87.4) |
| Black | 6,964 (7.5) | 3,434 (7.4) | 3,530 (7.6) |
| Hispanic | 2,252 (2.4) | 1,139 (2.5) | 1,113 (2.4) |
| Other | 2,336 (2.5) | 1,172 (2.5) | 1,164 (2.5) |
| Elixhauser Comorbidity Index | |||
| 0 | 15,581 (16.9) | 7,817 (16.9) | 7,764 (16.8) |
| 1 | 19,691 (21.3) | 9,843 (21.3) | 9,848 (21.3) |
| 2 | 17,199 (18.6) | 8,501 (18.4) | 8,698 (18.8) |
| ≥ 3 | 39,965 (43.2) | 20,057 (43.4) | 19,908 (43.1) |
| Initial Diagnosis | |||
| Biliary Colic | 60,385 (65.3) | 30,260 (65.5) | 30,125 (65.2) |
| Acute Cholecystitis | 24,633 (26.7) | 12,195 (26.4) | 12,438 (26.9) |
| Common Bile Duct Stones | 5,224 (5.7) | 2,633 (5.7) | 2,591 (5.6) |
| Gallstone Pancreatitis | 2,194 (2.4) | 1,130 (2.4) | 1,064 (2.3) |
| Location of Initial Visit | |||
| Physician Visit | 84,755 (91.7) | 42,325 (91.6) | 42,430 (91.8) |
| Emergency Room Visit | 7,681 (8.3) | 3,893 (8.4) | 3,788 (8.2) |