Predicting risk of mortality in dialysis patients: a retrospective cohort study evaluating the prognostic value of a simple chest X-ray

Table 6 Analysis of confounding: the impact of AAC is dramatically reduced by adjustment for age and other variables

Variable	Unadjusted hazard ratio	P value	Age-adjusted hazard ratio	P value	Fully adjusted hazard ratio*	P value
AAC		<0.001		0.06		0.03
0	referent		referent		referent
1	2.43 [1.64, 3.61]		1.52 [0.99, 2.33]		1.52 [0.99, 2.34]
2	2.22 [1.41, 3.49]		1.15 [0.69, 1.92]		1.22 [0.72, 2.05]
3	4.35 [2.48, 7.66]		2.00 [1.07, 3.75]		2.49 [1.28, 4.82]

*Adjusted for all variables in the best base model: age at x-ray, race, sex, duration of dialysis, diabetic status, history of heart failure, ischemic heart disease, serum phosphate, and serum creatinine at initiation of dialysis.

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