Fig. 5: Overview of study design and outcome for studies of spinal cord injury in humans.
From: Impact of commonly administered drugs on the progression of spinal cord injury: a systematic review

Icons are used to indicate the route of administration (intravenous, oral, intramuscular) of the drug of interest, and central aspects of study design, where prospective and retrospective refer to how data collection and analysis were planned and completed, while cross-over refers to a study design in which measurements taken pre- and post-exposure to a drug of interest were compared, which deviates from a split of individuals into control and treatment otherwise used. *: 71 participants were recruited for this study, of which 19 did not meet the inclusion criteria; **: 410 patients were excluded from the analysis in this study, making up the difference between sizes reported for the no treatment and intervention groups. Vit D: Vitamin D. The figure includes the following icons obtained from thenounproject.com: “Direction” icon by Uswa KDT CC BY 3.0, “Pill” icon by Three Six Five CC BY 3.0, “Shuffle” icon by Gregor Cresnar CC BY 3.0, “Syringe” icon by arman maulana CC BY 3.0, “Vaccination” icon by WiStudio CC BY 3.0, and “Empty set” icon by Gregor Cresnar CC BY 3.0.