Table 3: The predictive variables for serum phosphorus clearance.

Unstandardized coefficients
Unstandardized coefficients Std. error Standardized coefficients beta

Constant 7.6250.115
Pre-P6.8211.1330.460<0.001
CRR0.4930.0860.439<0.001
Membrane SA7.3073.1260.1910.022
Qb0.0510.0240.1770.034

Note. Pre-P: predialysis serum phosphate, CRR: creatinine reduction ratio, membrane SA: membrane surface area, and Qb: blood flow rate.