Op end was filled in from the recording end in 537 cases¶
In 537 cases (8.4%) the op end is exactly 10 minutes before the end of the recording, so it was filled in rather than charted. These cases are concentrated in thoracic surgery and under sedation or spinal anaesthesia.
| Status | established: shown on many cases, with a control. |
| Clocks | Hospital records clock |
| Devices | Clinical records |
| Variables | Operation end time |
What it means¶
Op end, operation duration and emergence time are not measured in these cases, and leaving them out biases any analysis towards general-anaesthesia, non-thoracic cases.
What is done about it¶
The value model returns status imputed for them; analyses should report how many cases they drop and from which groups.
Detail¶
The rule: recording end minus op end lies between 598 and 604 s. Shares by group:
| Group | Cases | Imputed |
|---|---|---|
| Thoracic surgery | 1,111 | 16.6% |
| General surgery | 4,930 | 6.9% |
| Gynaecology | 230 | 3.5% |
| Urology | 117 | 3.4% |
| Sedation | 72 | 41.7% |
| Spinal | 273 | 30.0% |
| General anaesthesia | 6,043 | 7.0% |
| Emergency | 782 | 9.8% |
| Elective | 5,606 | 8.2% |
Evidence¶
| Study | Date | Status | Summary |
|---|---|---|---|
| How the operation end time was charted | 2026-10-18 | current | The charted operation end time is a mixture of 4 ways of writing a clock time (floor_30min, floor_10min, floor_5min, clock_minute), modelled as an offset from a device time. |
| Imputed times, conformance failures and exclusion rules | 2026-10-13 | current | About one in twelve op ends was set from the recording rather than charted, and a small set of times fail basic conformance checks; all are encoded as exclusion rules. |