Mean monthly number of admissions, observed and expected deaths, by follow-up time (in quarters)
| Time in months | Admissions | Observed deaths | Expected deaths |
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
| Prealert | |||
| 1–3 | 44.8 (38.4 to 51.1) | 2.42 (2.20 to 2.64) | 1.86 (1.68 to 2.03) |
| 4–6 | 46.0 (39.4 to 52.6) | 2.64 (2.41 to 2.86) | 1.88 (1.71 to 2.05) |
| 7–9 | 46.1 (39.7 to 52.5) | 3.00 (2.73 to 3.27) | 1.93 (1.74 to 2.12) |
| 10–12 | 46.2 (39.8 to 52.6) | 3.77 (3.43 to 4.10) | 1.99 (1.80 to 2.18) |
| Lag period | |||
| 13–15 | 46.7 (40.2 to 53.3) | 2.49 (2.23 to 2.75) | 1.93 (1.75 to 2.11) |
| 16–18 | 46.5 (39.9 to 53.1) | 2.21 (1.97 to 2.45) | 1.81 (1.64 to 1.98) |
| 19–21 | 46.9 (40.6 to 53.2) | 2.37 (2.12 to 2.62) | 1.96 (1.78 to 2.15) |
| Post lag | |||
| 22–24 | 46.2 (40.2 to 52.2) | 2.20 (1.97 to 2.43) | 1.93 (1.75 to 2.12) |
| 25–27 | 46.6 (40.5 to 52.8) | 2.26 (2.03 to 2.50) | 1.94 (1.76 to 2.13) |
| 27–29 | 45.4 (39.5 to 51.3) | 2.07 (1.83 to 2.31) | 1.93 (1.73 to 2.13) |
| 30–33 | 44.6 (38.8 to 50.3) | 2.22 (1.95 to 2.49) | 1.93 (1.73 to 2.14) |
| 34–35 | 44.7 (37.2 to 52.2) | 1.89 (1.59 to 2.18) | 1.79 (1.54 to 2.03) |
Mean monthly statistics are calculated from individual trust, diagnosis/procedure group data. Observed and expected numbers of death are inpatient deaths. Expected deaths are estimated using case mix risk adjustment.