Association between the Charlson Comorbidity Index and the risk of 30-day unplanned readmission in patients receiving maintenance dialysis

Table 4 Association between CCI and 30-day readmission adjusted for gender, dialysis modality and other variables, respectively

CCI Subgroup	Gender-adjusted HR	Gender and dialysis modality-adjusted HR	Multivariable-adjusted HR^a
CCI = 2	1	1	1
3 < =CCI < =4	0.99 (0.95,1.01)	1.01 (0.97,1.05)	1.01 (0.98,1.05)
5 < =CCI < =6	1.04 (1.00,1.08)	1.09 (1.05,1.14)	1.09 (1.05,1.14)
CCI > 6	1.07 (1.02,1.12)	1.14 (1.09,1.19)	1.14 (1.09,1.20)

Abbreviations: CCI Charlson Comorbidity Index, HR hazard ratio
^aAdjusted for gender, the length of hospital stay, the receipt of mechanical ventilation, rescue, admission through emergency, the modality of dialysis and admission to intensive care unit (ICU)

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