Intraoperative crystalloid¶

Intraoperative crystalloid (clinical table).


Name in the dataset	`intraop_crystalloid`
Type	clinical
Stored in	clinical_data.csv
Unit	mL

Measurement space¶

Vertical slices through the measurement space: how the true value is spread around a recorded one, for 3 recorded values chosen to show the different cases. Each panel has its own scale. Each is averaged over every record with that value in the release, from the pinned model; groups of fewer than 20 records are not shown.

300 mL (the commonest recorded value; 470 records): mean -0.751 mL, SD 24.8 mL, 95% between -46.6 and +45.6. Rounding: 100 mL 64%, 50 mL 35%.
150 mL (the narrowest; 146 records): mean +0.89 mL, SD 13.7 mL, 95% between -22.9 and +22.7. Rounding: 50 mL 99%.
100 mL (unlike the others; 197 records): mean +7.47 mL, SD 23.4 mL, 95% between -40.9 and +47.2. Rounding: 100 mL 64%, 50 mL 36%.

Joint map of recorded against true value for Intraoperative crystalloid — Joint map: across, the recorded value; up, the true value minus the recorded one. Colour is the share of all probability in the release (5,980 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¶

This variable carries no time of its own in the dataset.

Value¶


Model kind	model: fitted rounding model (value kind); posterior over the true value
Resolution	heaped: a mixture of rounding modes (see the value model)
Anchor	nearest (tested)
Status	measured
Studies	Rounding and heaping of intraoperative crystalloid

In this release¶

How wide the true-value distribution is, record by record, over 5,980 of 6,388 records (all clinical rows) that have one. Computed with the pinned model, aggregates only.

	Median	p10 to p90
Standard deviation	24.7 mL	13.8 to 24.8 mL
95% interval width	92 mL	45.6 to 92.2 mL
Mean minus recorded	-0.287 mL	-2.23 to 1.75 mL

Anchor¶

Nearest rounding preferred to floor (H1, last graduation passed) by BIC: 47 with the duration covariate, 12 without (same 5863 records; results/2026-10-18_refits_duration_zero.md). See what an anchor is and every variable's anchor.

Value model¶

Model file: …/models/intraop_crystalloid.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. With no conditions, the shares follow directly.

Order	Rule	Rounds to	Probability if reached	Share of records
1	100 mL	100 mL (nearest)	47.8 %	47.8 %
2	50 mL	50 mL (nearest)	96.1 %	50.1 %
3	10 mL (base)	10 mL (nearest)	the rest	2.1 %


Recorded resolution	1 (modelled at 10)
True-value density	log_spline
Fitted on	5,863 records (VitalDB clinical_data.csv (intraop_crystalloid), positive values on the 10 mL grid with a usable anaesthesia duration)
BIC	40,379
Fitted	2026-10-18

Only 6 of 5,980 values are not multiples of 10; flagged off_grid.

Studies¶

Study	Date	Status	Summary
Rounding and heaping of intraoperative crystalloid	2026-10-18	current	Recorded intraoperative crystalloid is a mixture of 3 rounding modes (100 mL, 50 mL, 10 mL (base)); the model gives the true value's distribution for each record.

Worked examples¶

Example	Side	Status	Summary
Intraoperative fluid balance as a distribution	value	draft	Fluids in minus fluids out, each a heaped charted volume, as a distribution per case: the recording alone makes a balance uncertain by about ±60 mL, and by ±190 mL when the blood loss was written as a round 500 mL.

Figures¶

Histogram of the recorded values of intraop_crystalloid. — Recorded values in the release: 5,980 records, median 700 mL; 34 outside the 0.5–99.5th percentiles are not shown.

Tags: generated, vitaldb-resolution