Fig. 4

Association between low or high Hb and in-hospital death based on the severity of CKD after multivariable corrections. a, Non-CKD. b, CKD. c, Early CKD. d, Advanced CKD (the subgroups with Hb levels > 14 g/dL were merged). The correction variables in the logistic regression model included age stratification (≤55 years, 56–75 years, and > 75 years) and CCI scores (every 1-point increase) (Enter Model). Bars represent the ORs and 95% confidence intervals