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Fig. 1 | BMC Medical Research Methodology

Fig. 1

From: Primary and secondary data in emergency medicine health services research – a comparative analysis in a regional research network on multimorbid patients

Fig. 1

Illustration of primary and secondary data samples across the three study populations in EMANET. Legend: Ellipses depict the primary data sample and rectangles secondary data samples used for analyses. Arrows between shapes illustrate data samples which were compared numerically in this study. Numbers summarize patients with relevant study diagnoses for all three research projects (EMAAGE, EMACROSS, EMASPOT). 1The sample of the general ED population registered between 8am and 5pm excludes ED patients with study-related diagnoses from EMAAGE since patients were recruited into this study on wards following ED treatment without time restrictions. Abbreviations: ED: emergency department, HIS: hospital information system

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