Missing data from the ward registries, before and after data cleaning
| Before data cleaning | After data cleaning | |
| Number of observations | 3005 | 2945 |
| Number of missing observations by variable (%) | ||
| Patient MRN | 247 (8.2) | 247 (8.4) |
| Age | 152 (5.1) | 141 (4.8) |
| City/Region of residence | 80 (2.7) | 72 (2.4) |
| Admission date | 9 (0.3) | 8 (0.3) |
| Discharge date | 281 (9.4) | 244 (8.3) |
| Diagnosis and/or procedure performed | 46 (1.5) | 34 (1.2) |
MRN, medical record number.