Table 6.

Association between four variable MDRD GFR quintiles and rate of plaque growth:

Variable	β Coefficient	P
MDRD GFR quintile		0.4
q1 (<18 ml/min/1.73 m2)	0.03 (−0.17 to 0.22)
q2 (18 to 23 ml/min/1.73 m2)	−0.11 (−0.31 to 0.08)
q3 (>23 to 28 ml/min/1.73 m2)	−0.02 (−0.22 to 0.17)
q4 (>28 to 34 ml/min/1.73 m2)	0.08 (−0.11 to 0.28)
q5 (>34 ml/min/1.73 m2) (ref.)	0.0
Constant	0.24 (0.11 to 0.38)	0.001