Fistula-first and catheter-last: fading certainties and growing doubts
Bibliographic record
Abstract
In this issue of Nephrology Dialysis and Transplantation, Grubbs et al. [1] present USRDS data on the association between vascular access type at hemodialysis initiation and 6-month mortality in 117 277 patients who started hemodialysis therapy between January 2005 and December 2007. Thanks to additional access information included in the End-Stage Renal Disease Medical Evidence Report (form CMS-2728) since 2005 [2], the authors were able to classify the initial hemodialysis access as either fistula alone, graft alone, catheter with maturing fistula, catheter with maturing graft or catheter alone. The authors found that, compared with people using a fistula, the risk of death from all causes was progressively higher in people using grafts, in those using catheters with a maturing fistula, in those using catheters with a maturing graft and in those using catheter without a maturing arteriovenous access. Six-month mortality data were similar to long-term results from a previous analysis of USRDS data [3].
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.025 | 0.042 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.006 |
| Scholarly communication | 0.004 | 0.012 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.007 | 0.011 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".