Table 4. Linear regression analysis—length of hospital stay.
| Variables | Univariate analysis | Multivariate analysis | |||
|---|---|---|---|---|---|
| RC (95% CI) | P value | RC (95% CI) | P value | ||
| Subgroups | 2.789 (2.069 to 3.508) | <0.001 | 1.295 (0.652 to 1.937) | <0.001 | |
| Sex | 0.362 (−1.465 to 2.188) | 0.698 | |||
| Age | 0.025 (−0.032 to 0.083) | 0.388 | |||
| Etiology | 0.059 (−0.821 to 0.940) | 0.895 | |||
| Severity (2012RAC) | 4.465 (3.747 to 5.183) | <0.001 | 2.829 (2.017 to 3.641) | <0.001 | |
| Complications | 9.781 (7.815 to 11.75) | <0.001 | 2.895 (0.499 to 5.291) | 0.019 | |
| Ca+ | −2.745 (−9.160 to 3.669) | 0.402 | |||
| Cl+ | −0.232 (−0.543 to 0.079) | 0.146 | |||
| Necrosis | 7.458 (5.379 to 9.537) | 0.001 | 2.109 (−0.053 to 4.270) | 0.057 | |
| APACHE II | 0.331 (0.014 to 0.648) | 0.042 | 0.075 (−0.167 to 0.318) | 0.543 | |
| BISAP | 0.644 (−0.311 to 1.600) | 0.188 | |||
| EPIM | 0.639 (0.096 to 1.181) | 0.022 | −0.299 (−0.791 to 0.194) | 0.236 | |
| MRSI | 1.625 (1.220 to 2.030) | <0.001 | 0.339 (−0.166 to 0.843) | 0.189 | |
Dependent variable: length of hospital stay. Subgroups: different parts of the pancreas involved in acute pancreatitis. Type I, head of the pancreas; type II, body and tail of the pancreas; type III, whole pancreas (head, body and tail of the pancreas are involved). +, indicates elemental ions. RC, regression coefficient; CI, confidence interval; 2012RAC, 2012 Revised Atlanta Classification; Ca, calcium; Cl, chloride; APACHE II, Acute Physiology and Chronic Health Evaluation II; BISAP, Bedside Index of Severity in Acute Pancreatitis; EPIM, extrapancreatic inflammation on magnetic resonance imaging; MRSI, magnetic resonance severity index.