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A hospital-based cluster-randomized controlled trial of free influenza vaccination before hospital discharge compared to routine care in patients with heart failure (PANDA II): Statistical Analysis Plan

Shan, S.; Billot, L.; Du, X.; Dong, J.; Anderson, C. S.

2024-12-21 cardiovascular medicine
10.1101/2024.12.20.24319430 medRxiv
Show abstract

The PANDA II trial aims to evaluate whether a free influenza vaccination program for patients hospitalized in China with acute heart failure provides benefits compared to current routine practice of no influenza vaccination. It is designed as a two-arm, parallel, cluster-crossover randomized trial of 122 hospitals conducted over three influenza seasons. This statistical analysis plan pre-specifies the method of analysis for every outcome and key variable collected in the trial. The primary outcome is a composite of all-cause mortality and re-admission to hospital within a 12- month period after the initial 30-day post-discharge period. The primary analysis will include all recruited participants analysed according to the intervention allocated to the hospital during their enrolment period. It will consist in an individual-level hierarchical logistic regression adjusted for the effect of the period and for clustering by hospital using both a random hospital effect and a random hospital-period effect. The effect of the influenza vaccination program will be estimated as an odds ratio and 95% confidence interval. Sensitivity analyses will include covariate adjustments as well as a cluster-level analysis and subgroup analyses according to eight pre-specified subgroups.

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