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Anesthesia start time

Anesthesia start time; from casestart (clinical table).
Name in the dataset anestart
Type time
Stored in clinical_data.csv
Stamped by Hospital records clock
Unit sec

Description

Charted clock minute modelled as an offset from the recording start (device time). See the Timestamps section.

How its time was recorded is described with Anaesthesia record events.

Measurement space

-20020true minus recorded (min)1. recorded at :40 past the hourdensity-101true minus recorded (min)2. recorded at :42 past the hourdensity-202true minus recorded (min)3. recorded at :25 past the hourdensity-505true minus recorded (min)4. recorded at :10 past the hourdensity

Vertical slices through the measurement space: how the true value is spread around a recorded one, for 4 recorded minutes of the hour chosen to show the different cases. Each panel has its own scale. Each is averaged over every record with that minute in the release, from the pinned model; groups of fewer than 20 records are not shown.

  1. :40 (the commonest recorded value; 633 records): mean +0.753 min, SD 5.36 min, 95% between -11.1 and +14.4. Rounding: nominal_0740 39%, nearest_5min 34%, nearest_10min 14%.
  2. :42 (the narrowest; 123 records): mean +0.495 min, SD 0.293 min, 95% between -0.133 and +0.891. Rounding: clock_minute 100%.
  3. :25 (unlike the others; 154 records): mean +0.198 min, SD 1.19 min, 95% between -2.39 and +2.22. Rounding: nearest_5min 64%, clock_minute 36%.
  4. :10 (unlike the others; 229 records): mean +0.0181 min, SD 2.08 min, 95% between -4.55 and +4.24. Rounding: nearest_10min 41%, nearest_5min 37%, clock_minute 21%.
Joint map of recorded against true value for Anesthesia start time
Joint map: across, the recorded minute of the hour; up, the true value minus the recorded one. Colour is the share of all probability in the release (6,387 records), on a log scale. Each column is a slice like those above; tall columns are values people round to, narrow ones values written as measured.

Time

Its time side is still to be described.

Value
Model kind timestamp_model: fitted reference-offset model; posterior over the true event time
Resolution heaped: a mixture of rounding modes (see the value model)
Status measured
Studies How the anesthesia start time was charted

In this release

How wide the true-value distribution is, record by record, over 6,387 of 6,388 records (all clinical rows) that have one. Computed with the pinned model, aggregates only.

Median p10 to p90
Standard deviation 66.6 sec 17.3 to 141 sec
95% interval width 269 sec 57 to 546 sec
Mean minus recorded 28.8 sec -13.5 to 31.6 sec

Value model

Model file: …/models/anestart.model.json. Read from the pinned snapshot of vitaldb-resolution at commit bb03ddfc8a (2026-10-18).

How a true value becomes the recorded one. The rules are tried in order: a record not taken by an earlier rule is taken by this one with the probability shown (where its condition holds); the last rule takes the rest. Shares of all records depend on the conditions and the true value, so the model must be evaluated for them; the probabilities below are the fitted ones.

Order Rule Rounds to Probability if reached Applies when
1 nominal_0740 written as 460 13.2 % true clock minute in [440, 480); reference clock minute in [390, 540)
2 nominal_0730 written as 450 9.6 % true clock minute in [430, 470); reference clock minute in [390, 540)
3 nearest_10min 10 clock minute (nearest) 11.5 % varies with emop, ref_window
4 nearest_5min 5 clock minute (nearest) 21.7 % varies with emop, ref_window
5 clock_minute 1 clock minute (floor) the rest always
  • nominal_0740: first-case start written as 07:40 when the true start is 07:20-08:00; window width not identifiable (+-20 and +-40 fit equally)
  • nominal_0730: first-case start written as 07:30 when the true start is 07:10-07:50
Recorded resolution 1 min (chronon) (modelled at 1)
True-value density reference_offset_spline
Covariates ref, ref_window (first_case if recording starts 06:30-09:00; evening_night if it starts 19:00-06:00; otherwise day), emop
Fitted on 6,387 records (clinical_data.csv)
BIC 43,535
Fitted 2026-10-18

Time and value together

Coupled. The value is itself a time: its value side and its time side are the same uncertainty.

Studies

Study Date Status Summary
How the anesthesia start time was charted 2026-10-18 current The charted anesthesia start time is a mixture of 5 ways of writing a clock time (nominal_0740, nominal_0730, nearest_10min, nearest_5min, clock_minute), modelled as an offset from a device time.

Figures

Histogram of the recorded values of anestart.
Recorded values in the release: 6,388 records, median -583 sec; 64 outside the 0.5–99.5th percentiles are not shown.

Tags: generated, vitaldb-resolution