Table 2.
Annual death rates from 1992 to August 1995, with odds ratios relative to 1992
| 1992 | 1993 | 1994 | Jan-Aug 1995 | Total | |
|---|---|---|---|---|---|
| No of operations | 1093 | 1125 | 971* | 794 | 3983 |
| Mean (SE) age of patients (years) | 62.3 (0.32) | 61.1 (0.34) | 63.5 (0.36) | 63.6 (0.38) | 62.5 (0.18) |
| Catastrophic state: | |||||
| No of patients | 28 | 30 | 34 | 24 | 116 |
| % (No) of predicted deaths | 48 (13.4) | 48 (14.4) | 49 (16.7) | 48 (11.5) | 48 (55.7) |
| % (No) of observed deaths | 39 (11) | 47 (14) | 47 (16) | 46 (11) | 45 (52) |
| Death: | |||||
| % (No) predicted | 9.1 (100.0) | 8.7 (97.3) | 10.6 (102.9) | 9.5 (75.7) | 9.4 (375.9) |
| % (No) observed | 5.6 (61) | 7.3 (82) | 7.5 (73) | 7.7 (61) | 7.0 (277) |
| Difference between predicted and observed No of deaths: | |||||
| No | 39.0 | 15.3 | 29.9 | 14.7 | 98.9 |
| As % of predicted deaths | 39 | 16 | 29 | 19 | 36 |
| Odds ratio (95% CI)† | 1 | 1.5 (1.0 to 2.1) | 1.2 (0.8 to 1.7) | 1.4 (0.9 to 2.0)‡ | |
*
Throughput was down because one ward was closed temporarily.
†
Logistic regression model of death rate.
‡
P=0.18 in χ2 test for difference in annual death rate.