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Biostatistics Case Essay Preview: Biostatistics Case Report this essay Age: Continuous Urgency of operation ordinal Length of hospital stay continuous Type of surgery nominal Ejection fraction estimate ordinal Preoperative dialysis nominal Patients ages in each mortality groups Group Statistics Mortality Status Std. Deviation Std. Error Mean 65.1778 13.07279 .41909 72.4766 6.58434 1.29130 Independent Samples Test.