| Parameterization (corresponding parameter in the model) |
---|
Group | X1 (β1) | X2 (β2) | X3 (β3) | X4 (β4) |
---|
1) SCr-, UO-, FOL-
| 0 | 0 | 0 | 0 |
2) SCr-, UO-, FOL+
| 1 | 0 | 0 | 0 |
3) SCr-, UO+, FOL-
| 1 | 1 | 0 | 0 |
4) SCr-, UO+, FOL+
| 1 | 1 | 1 | 0 |
5) SCr+
| 1 | 1 | 1 | 1 |
- Each group variable or combination of SCr/UO/FOL status was parameterized as above so that the group variable could be considered as an ordinal variable in the multiple linear regression model. β1 indicates a comparison between SCr-, UO-, FOL- and SCr-, UO-, FOL+, β2 indicates a comparison between SCr-, UO-, FOL + and SCr-, UO+, FOL- and so forth.
-
SCr+: Meeting the criteria of Change in SCr ≥ 26.5 µmol/L; SCr -: Not meeting the Change in SCr criteria.
-
UO+: Meeting the criteria of Urine Output ≤0.5 cc/kg/hour for greater than 6 hours; UO-: Not meeting the Urine Output criteria.
-
FOL+: Meeting the criteria of Fluid Overload, defined as fluid balance ≥ 6.5 cc/kg; FOL-: Not meeting the Fluid Overload criteria.