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Factors associated with 30-day mortality after hospitalisation, stratified by median value of cardiothoracic medicine specialists. The OR, marked by a circle, was calculated by multilevel analysis adjusted for inpatient-level characteristics and hospital-level characteristics, and results were statistically significant if each bar as marked to SD has not reached the cutoff line in 1.00. UCL=95% upper confidence limit, LCL=95% lower confidence limit.
