Relative Effectiveness of High-Dose Versus Standard-Dose Influenza Vaccination Against Hospitalizations and Deaths According to Frailty Score: A Post Hoc Analysis of the DANFLU-1 Randomized Trial
Bibliographic record
Abstract
BACKGROUND: Frailty is a risk factor for adverse influenza-related outcomes. We assessed the effectiveness of high-dose inactivated influenza vaccination (HD-IIV) versus standard-dose inactivated influenza vaccination (SD-IIV) according to a frailty score. METHODS: This was a post hoc analysis of the randomized feasibility trial of HD-IIV versus SD-IIV conducted during the 2021-2022 influenza season in older adults aged 65-79 years. We assessed prespecified outcomes, including hospitalizations and deaths, as first and recurrent events. Frailty was defined according to the hospital frailty risk score (HFRS). RESULTS: Among 12 477 included participants (mean age, 71.7 years; 47.1% female), 10 689 (85.7%) were categorized as having low frailty (HFRS <5) and 1784 (14.3%) had intermediate or high frailty (HFRS ≥5). HD-IIV versus SD-IIV was associated with a lower risk of first and recurrent hospitalizations for pneumonia or influenza regardless of the HFRS. For participants with low frailty there were 22 events (hazard ratio [HR], 0.37 [95% confidence interval, .15-.96]) and 25 recurrent events (incidence rate ratio, 0.31 [.11-.84]), and for those with intermediate or high frailty there were 16 events (HR, 0.33 [.11-1.01]) and 18 recurrent events (incidence rate ratio, 0.28 [.09-.92]; P value for continuous interaction with HFRS [Pinteraction] = .92 for first and Pinteraction = .93 for recurrent events). The HFRS modified the association of HD-IIV versus SD-IIV with all-cause mortality (Pinteraction = .02), with an association with reduced risk in participants with low frailty only (43 events, HR, 0.26 [95% confidence interval, .13-.55]). CONCLUSIONS: HD-IIV was associated with a lower risk of first and recurrent hospitalizations for pneumonia and influenza compared with SD-IIV and may be preferred for older adults, irrespective of frailty status. The HFRS modified the association of HD-IIV versus SD-IIV with all-cause mortality.
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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 | 0.014 | 0.016 |
| Meta-epidemiology (narrow) | 0.003 | 0.001 |
| Meta-epidemiology (broad) | 0.008 | 0.009 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".