Table 1.
Summary of studies performing a risk prediction analysis in patients submitted to liver resection included for review
| All studies | Studies based on clinical data | Studies based on administrative data | |
|---|---|---|---|
| Studies, n | 91 | 79 | 12 |
| Origin, n | |||
| Western seriesa | 55 | 43 | 12 |
| Eastern series | 36 | 36 | 0 |
| Data sources, n | |||
| Clinical database | 79 | 79 | 0 |
| Administrative database | 12 | 0 | 12 |
| Study design, n | |||
| Prospective | 11 | 11 | 0 |
| Retrospective | 80 | 68 | 12 |
| Data collection, n | |||
| Prospective | 84 | 72 | 12 |
| Retrospective | 6 | 6 | 0 |
| Unclear | 1 | 1 | 0 |
| Number of patients, median (range) | 323 (99–50 537) | 266 (99–1803) | 2834 (569–50 537) |
| Inclusion period, n | |||
| <5 years | 27 | 21 | 6 |
| 5–10 years | 33 | 27 | 6 |
| >10 years | 28 | 28 | 0 |
| Unclear | 4 | 4 | 0 |
| Indications for surgery, n | |||
| Malignancy | 52 | 46 | 6 |
| Benign disease | 1 | 1 | 0 |
| Benign and malignant diseases | 31 | 25 | 6 |
| Benign, malignancy, living donor | 4 | 4 | 0 |
| Living donor | 2 | 2 | 0 |
| Unclear | 1 | 0 | 1 |
a
USA, Europe, Canada and New Zealand.