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

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

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]  
  1. *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.