Table 1.
Comparison of clinical and laboratory findings among patients, with and without SAP (training sample set).
| Variable | Training set (n = 487) | Test set (n = 161) | P-value |
|---|---|---|---|
| Age, years (IQR) | 47 (37,61) | 49 (36,64) | 0.501 |
| Male sex, N (%) | 301 (61.81) | 103 (63.98) | 0.623 |
| Duration of symptoms (days, IQR) | 1.83 ± 0.80 | 1.78 ± 0.78 | 0.515 |
| BMI, kg/m2 (IQR) | 23.5 (21.1-26.3) | 23.9 (21.5-21.5) | 0.573 |
| SIRS, N (%) | 191 (39.22) | 65 (40.37) | 0.795 |
| Biliary etiology, N (%) | 207 (42.51) | 68 (42.24) | 0.584 |
| Laboratory findings | |||
| Hematocrit (l/l) | 0.42 (0.38-0.46) | 0.42 (0.38-0.46) | 0.693 |
| Platelets (109/L) | 199 (161-233) | 195 (157-233) | 0.472 |
| Prothrombin time, s (IQR) | 13.8 (13.1-14.6) | 13.7 (13.0-14.5) | 0.278 |
| Albumin, g/L (IQR) | 36.3 (32.6-39.9) | 36.4 (34.0-39.8) | 0.191 |
| Total bilirubin, mmol/L (IQR) | 20 (14-31) | 20 (13-32) | 0.916 |
| ALT, U/L (IQR) | 43 (19-119) | 31 (19-82) | 0.055 |
| AST, U/L (IQR) | 39 (22-88) | 28 (19-71) | 0.012 |
| Glucose, mmol/L (IQR) | 7.9 (6.3-10.5) | 8.4 (6.7-11.3) | 0.128 |
| Serum creatinine, μmol/L (IQR) | 64 (54-77) | 64 (55-76) | 0.882 |
| BUN, mmol/L (IQR) | 4.8 (3.7-6.1) | 4.9 (4.0-6.2) | 0.346 |
| Total cholesterol, mmol/L (IQR) | 4.79 (3.8-6.2) | 4.8 (3.8-6.1) | 0.970 |
| HDL, mmol/L (IQR) | 1.0 (0.7-1.3) | 1.0 (0.8-1.3) | 0.461 |
| LDL, mmol/L (IQR) | 2.5 (1.9-3.2) | 2.2 (1.8-3.0) | 0.100 |
| Triglyceride (mg/dL), mmol/L (IQR) | 1.3 (0.8-3.4) | 1.3 (0.8-3.6) | 0.995 |
| Serum calcium, mmol/L (IQR) | 2.7 (2.1-2.3) | 2.2 (2.1-2.3) | 0.051 |
| C-reactive protein, mg/L (IQR) | 35.0 (11.7-90.0) | 29.4 (8.7-85.3) | 0.415 |
| Pleural effusion, N (%) | 89 (18.28) | 35 (21.74) | 0.333 |
| Patients with SAP, N (%) | 49 (10.1) | 16 (9.9) | 0.0092 |
| Length of hospital stay, days (IQR) | 10 (7-13) | 11 (7-15) | 0.964 |
| Hospital mortality, N (%) | 9 (1.85) | 1 (0.62) | 0.274 |
Data were mean ± standard deviation, or numbers and percentages, or median (25th–75th percentile), as appropriate. N, number; IQR, interquartile range; BMI, body mass index; SIRS, systemic inflammatory response syndrome; ALT, alanine aminotransferase; AST, aspartate aminotransferase; HDL, high-density lipoprotein cholesterol; LDL, low-density lipoprotein cholesterol.