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. Author manuscript; available in PMC: 2007 Nov 7.
Published in final edited form as: JAMA. 2005 Jul 6;294(1):81–90. doi: 10.1001/jama.294.1.81

Table 4.

Proportional Hazards (Cox) Regression Analysis of Mortality

Risk Factor Total* # of
Deaths		 p** Risk Ratio
(RR)*** 		95% CI****
for RR
Low arginine/ornithine 207 18 .006 2.5 (1.2, 5.2)
TR jet velocity ≥ 2.5 222 18 <.001 7.4 (2.4, 22.4)
Low arginine/ornithine, adjusted
for TR jet velocity (< 2.5 or ≥ 2.5)		 203 18 .019 2.2 (1.0, 4.7)
TR jet velocity ≥ 2.5, adjusted
for arginine/ornithine		 203 18 <.001 6.3 (2.1, 19.2)
Low arginine/ornithine, adjusted
for TR jet velocity (< 2.5 or ≥ 2.5)
& log10 creatinine		 201 18 .023 2.2 (1.0. 4.9)
Low arginine/(ornithine+citrulline) 207 18 <.001 3.6 (1.5, 8.3)
Low arginine/(ornithine+citrulline),
adjusted for TR jet velocity
(< 2.5 or ≥ 2.5)		 203 18 .002 3.3 (1.4, 7.6)
TR jet velocity ≥ 2.5, adjusted for
arginine/(ornithine+citrulline)		 203 18 <.001 6.1 (2.0, 18.6)
Low arginine/(ornithine+citrulline),
adjusted for TR jet velocity
(< 2.5 or ≥ 2.5) & log10 creatinine		 201 18 .007 2.9 (1.2, 7.0)
*

Numbers vary because of missing values for risk factors. Two individuals with no follow-up time are not included.

**

Likelihood ratio test.

***

For arginine/ornithine and arginine/(ornithine+citrulline), RR is given for 25th to 75th percentile, calculated as ecoefficient × (25th percentile – 75th percentile). For TR jet velocity, RR is given for values ≥ 2.5 (coded 1) relative to values < 2.5 (coded 0). Values shown are unadjusted for other risk factors unless otherwise indicated.

****

Confidence interval.

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