Patient, unit and nursing shift characteristics
| Variable | Value |
| Patients | |
| No. of admissions | 78 303 |
| Deaths—no. (%) | 3043 (3.9) |
| Age—years | |
| Mean (SD) | 62.0 (19.0) |
| Range | 18–112 |
| Male sex-no. (%) | 37 026 (47.3) |
| Charlson Index | |
| Mean (SD) | 2.4 (2.5) |
| Range | 0–21 |
| Units | |
| Intensive care unit—no. (%) | 13(38) |
| Medical—no. (%) | 9 (26) |
| Medi-surg—no. (%) | 6 (18) |
| Step-down care—no. (%) | 6 (18) |
| Shifts | |
| No. of patient days | 453 429 |
| All shifts | |
| No. of shifts | 133 742 |
| No. shifts with low RN staffing—no. (%) | 13 134 (9.8) |
| No. shifts with low NS staffing—no.(%) | 29 999 (22.4) |
| No. shifts with low RN and NS staffing—no.(%) | 5725 (4.3) |
| Patient turnover | |
| Patient turnover per day | |
| Mean | 0.33 (0.16) |
| Range | 0–1.00 |
| Per cent of shifts with high patient turnover | 8.0 |
NS, nursing supporting staff; RN, registered nurses.