Table 4.

Threshold Effect Analysis of Hb/RDW-SD on HF Readmission Within 3-Month Using Piece-Wise Linear Regression

	HF Readmission Within 3-Month (OR, 95% CI) P-value
Fitting model by standard linear regression	0.70 (0.55, 0.89)	0.0031
Fitting model by two-piecewise linear regression
Inflection points of Hb/RDW-SD	1.78, 2.17
< 1.78	0.38 (0.17, 0.87)	0.0209
1.78–2.17	1.02 (0.16, 6.34)	0.9815
> 2.17	0.44 (0.27, 0.71)	0.0007
P for log likelihood ratio test	0.002

Notes: We adjusted age, gender, occupation, MSCKD, SBP, DBP, type of HF, diabetes, creatinine, urea, GFR, albumin, potassium, sodium, BNP, total bilirubin, NYHA class, presence of LVEF.