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Statistical analysis plan for the Stroke Oxygen Study (SO2S): a multi-center randomized controlled trial to assess whether routine oxygen supplementation in the first 72 hours after a stroke improves long-term outcome.

Ives, Natalie; Sim, Julius; Gray, Richard; Roffe, Christine; Nevatte, Tracy; Howman, Andrew

Statistical analysis plan for the Stroke Oxygen Study (SO2S): a multi-center randomized controlled trial to assess whether routine oxygen supplementation in the first 72 hours after a stroke improves long-term outcome. Thumbnail


Authors

Natalie Ives

Richard Gray

Tracy Nevatte

Andrew Howman



Abstract

BACKGROUND: The Stroke Oxygen Study (SO2S) is a multi-center randomized controlled trial of oxygen supplementation in patients with acute stroke. The main hypothesis for the trial is that fixed-dose oxygen treatment during the first 3 days after an acute stroke improves outcome. The secondary hypothesis is that restricting oxygen supplementation to night time only is more effective than continuous supplementation. This paper describes the statistical analysis plan for the study. METHODS AND DESIGN: Patients (n?=?8000) are randomized to three groups: (1) continuous oxygen supplementation for 72 hours; (2) nocturnal oxygen supplementation for three nights; and (3) no routine oxygen supplementation. Outcomes are recorded at 7 days, 90 days, 6 months, and 12 months. The primary outcome measure is the modified Rankin scale at 90 days. Data will be analyzed according to the intention-to-treat principle. Methods of statistical analysis are described, including the handling of missing data, the covariates used in adjusted analyses, planned subgroups analyses, and planned sensitivity analyses. TRIAL REGISTRATION: This trial is registered with the ISRCTN register, number ISRCTN52416964 (30 September 2005).

Citation

Ives, N., Sim, J., Gray, R., Roffe, C., Nevatte, T., & Howman, A. (2014). Statistical analysis plan for the Stroke Oxygen Study (SO2S): a multi-center randomized controlled trial to assess whether routine oxygen supplementation in the first 72 hours after a stroke improves long-term outcome. Trials, 15, Article ARTN 229. https://doi.org/10.1186/1745-6215-15-229

Journal Article Type Article
Acceptance Date Jun 4, 2014
Publication Date Jun 16, 2014
Journal Trials
Publisher Springer Verlag
Volume 15
Article Number ARTN 229
DOI https://doi.org/10.1186/1745-6215-15-229
Keywords hypoxia; oxygen supplementation; randomized controlled trial; statistical analysis plan; stroke
Publisher URL https://trialsjournal.biomedcentral.com/articles/10.1186/1745-6215-15-229

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