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. Author manuscript; available in PMC: 2009 Oct 29.
Published in final edited form as: Am J Kidney Dis. 2007 Mar;49(3):365–372. doi: 10.1053/j.ajkd.2006.12.016

Table 2.

β Coefficients for Poor Exercise Capacity (METs < 5) by Quartile of Kidney Function

Quartile
II
III
IV
I β Coefficient P β Coefficient P β Coefficient P
Cystatin C (mg/L)
 Range 0.35-0.92 0.93-1.06 1.07-1.28 >1.29
 Unadjusted −0.82 0.005 −2.2 <0.0001 −3.5 <0.0001
 Adjusted −0.30 0.26 −1.0 0.0002 −1.7 <0.0001
eGFR (mL/min)
 Range >90 76.2-89.9 62.5-76.1 8.1-62.4
 Unadjusted −0.67 0.03 −0.90 0.003 −2.3 <0.0001
 Adjusted −0.01 0.96 −0.10 0.72 −6.5 0.03
Creatinine (mg/dL)
 Range 0.5-0.9 <0.9-1.0 1.1-1.2 >1.3
 Unadjusted +0.13 0.68 −0.51 0.07 −1.5 <0.0001
 Adjusted −0.22 0.43 −0.46 0.08 −0.75 0.01

Note: Adjusted for all variables in Table 1 (except kidney function variables). To convert GFR in mL/min to mL/s, multiply by 0.01667; serum creatinine in mg/dL to μmol/L, multiply by 88.4.