Univariate logistic regression of variables potentially associated with readmission
| Variable | Grouping | p Value | OR (95% CI) |
| Patient age | Continuous | <0.0001 | 1.03 (1.02 to 1.04) |
| Patient gender | Male | Reference | Reference |
| Female | <0.0001 | 0.72 (0.69 to 0.76) | |
| Length of stay | Continuous | <0.0001 | 1.04 (1.03 to 1.04) |
| Admission type | Day case | Reference | Reference |
| Elective | <0.0001 | 3.21 (2.84 to 3.64) | |
| Emergency | <0.0001 | 7.87 (7.26 to 8.52) | |
| Comorbidity score | Continuous | <0.0001 | 1.28 (1.25 to 1.31) |
| Accident and emergency visits in the previous 6 months | Continuous | <0.0001 | 1.39 (1.38 to 1.41) |
| LACE score | Continuous | <0.0001 | 1.42 (1.41 to 1.43) |
| Episodes per patient in the previous year | Continuous | <0.0001 | 1.06 (1.05 to 1.06) |