The study sample included patients aged ≥ 18 year who were suspected CRBSI from January 2009 to December 2018. All available patients were included: 642 in the non-CRBSI group and 153 in the CRBSI group. Assuming a mortality rate of 25.96% with CRBSI [15] and 10.9% with ICU-acquired infections [2], we calculated that group sample sizes of 209 in non-CRBSI group and 105 in CRBSI group achieve 80% power to detect a ratio in the group proportions of 0.5 by the PASS 11 software (NCSS, LLC. Kaysville, Utah, USA.

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