Table 5.

Regression model for GFR estimation: 10-h studiesa

ParameterCoefficient95% CIP
Fixed effects
    constant (ml/min/1.73 m2)58.646.4 to 70.8<0.001
    sampling time (h)−11.7−14.2 to −9.2<0.001
    sampling time2 (h2)0.6760.48 to 0.87<0.001
    eGFR (ml/min/1.73 m2)0.369−0.01 to 0.750.057
    eGFR × sampling time0.1190.04 to 0.200.003
    eGFR × sampling time2−0.007−0.013 to −0.0010.021
Random effects
    intercept SD7.665.01 to 11.72
    sampling time SD0.6240.380 to 1.027
    correlation (time, intercept)−0.85−0.96 to −0.53
    residual SD2.562.22 to 2.96
  • a Random coefficient model with maximal likelihood estimates.