Table 1

Demographic & clinical characteristics of study sample
Variable Total cohort (n = 70,114) Survived < 270 days (n = 17,177) Survived ≥ 270 days (n = 52,937) ± p-value
Comorbidity index scores
*Original Liu Comorbidity Index Score (mean ± st. dev.) Cannot be calculated Cannot be calculated 7.35 ± 3.99 N/A
**Modified Liu Comorbidity Index Score (mean ± st. dev.) 6.60 ± 3.75 7.30 ± 4.16 6.37 ± 3.58 <0.0001
Demographic and clinical characteristics
Age (years) (mean ± st. dev.) 61.5 ± 15.4 62.3 ± 16.4 61.2 ± 15.1 <0.0001
Gender (% women) 56.2% 53.8% 57.0% <0.0001
Race/Ethnicity <0.0001
Black 40.3% 39.0% 40.8%
Hispanic 18.0% 15.8% 18.8%
Other 6.0% 5.2% 6.2%
White 35.7% 40.0% 34.3%
Employed 2.5% 3.2% 2.3% <0.0001
Tobacco use 6.4% 6.4% 6.4% 0.7830
Substance abuse 2.9% 2.9% 2.8% 0.7413
Unable to ambulate 5.8% 7.9% 5.2% <0.0001
Unable to transfer 2.1% 3.3% 1.8% <0.0001
Home dialysis 4.9% 4.6% 5.0% 0.0589
Body Mass Index <0.0001
<20 10.4% 12.5% 9.7%
≥20 to < 24.99 30.0% 31.5% 29.5%
≥25 to <29.99 26.9% 26.2% 27.1%
≥30 32.8% 29.9% 33.7%
Hemoglobin >11 mg/dL 25.0% 24.8% 25.0% 0.4501
Primary renal diagnosis: <0.0001
Diabetes mellitus 53.0% 49.3% 54.2%
Hypertension 25.7% 26.5% 25.4%
Immune 7.4% 7.5% 7.3%
Other 14.0% 16.8% 13.1%
¶Diabetes mellitus 62.8% 60.3% 63.7% <0.0001
Congestive heart failure 34.2% 37.1% 33.3% <0.0001
Coronary artery disease 25.4% 27.2% 24.8% <0.0001
Cerebrovascular disease 11.1% 12.5% 10.6% <0.0001
Peripheral vascular disease 14.8% 16.6% 14.3% <0.001

*Original Liu Index captures comorbidity data from days 91–270 after dialysis initiation.

** Modified Liu Index 1–90 captures comorbidity data from days 1–90 after dialysis initiation.

± p-value for bivariate test statistic by survival group.

¶ Diabetes considered present if either noted as the primary cause for renal failure or as a comorbidity in claims data.

Rigler et al.

Rigler et al. BMC Nephrology 2013 14:51   doi:10.1186/1471-2369-14-51

Open Data