Data sharing statements: impact of journal policies across clinical research disciplines

Abstract

BACKGROUND AND AIMS: Cardiovascular disease is a leading cause of mortality, with significant investments in research to improve treatment and prevention. Data sharing enhances transparency, reproducibility, and collaboration, yet data sharing statement (DSS) inclusion remains inconsistent. This study evaluates DSS prevalence, content, and influencing factors in high-impact cardiology journals, examines journal policy influence, and assesses data sharing feasibility by contacting authors who indicated data availability. METHODS: A cross-sectional analysis was conducted to assess DSS inclusion in top cardiology, selected general medicine, emergency medicine, and orthopaedic surgery journals. A systematic PubMed search identified clinical studies published from 2020 to 2023. Logistic regression models assessed factors associated with DSS inclusion, while thematic analysis categorized DSS content. Corresponding authors who indicated data availability upon request were contacted to evaluate follow-through. RESULTS: Among 2941 articles, 1004 (34.14%) included a DSS. Data sharing statement prevalence varied by discipline: cardiology (52%), general medicine (96%), emergency medicine (12%), and orthopedic surgery (14%). Policy enforcement drove DSS inclusion, with post-policy articles significantly more likely to contain a DSS. Funding status, study design, article access, and impact factor also influenced DSS presence. Thematic analysis identified conditional availability and gatekeeping as dominant DSS themes. Of authors who stated data were available upon request, only 31% ultimately provided access. CONCLUSIONS: Data sharing statement inclusion in cardiology research remains inconsistent, with journal policies playing a key role in increasing prevalence. However, real-world data-sharing practices often fall short of stated commitments. Addressing logistical and financial barriers will be essential to improving data availability in cardiology research.