Table 1.

Patient characteristics, stratified by index age

Patient CharacteristicsAge Group, yr
<65 (n=19,149)65–74 (n=14,839)75–84 (n=27,012)≥85 (n=12,349)
Age, yr57±771±380±388±3
Male, %94989897
Race, %
 Black251499
 White62747878
 Other10877
Married, %45596356
Distance to closest VA facility (miles)43±4548±4648±4546±46
High complexity VA, %79757474
Copayment for VA services, %69848783
ZIP code median income, %
 ≤$35,00021181716
 $35,001–$42,00020202019
 $42,001–$50,00020222222
 $50,001–$62,00019202019
 ≥$62,00117182022
Residence, %
 Urban84818082
 Large city6788
 Rural6898
Comorbidities, %
 Diabetes mellitus46564634
 Ischemic heart disease24465351
 Heart failure15273233
 Peripheral arterial disease9192221
 Cerebrovascular disease7141717
 Paralysis1111
 Chronic pulmonary disease16272827
 Chronic liver disease9322
 Connective tissue disease2223
 Peptic ulcer disease1233
 Malignancy11192325
 Metastatic solid tumor1221
 AIDS20.40.10.1
 Dementia13712
 Depression30151315
Index eGFR, ml/min per 1.73 m223±624±625±525±5
Year of index date, %
 2005–200748596654
 2008–201052423446
  • 4% of patients were missing information on race, 0.7% were missing facility complexity, 0.4% were missing copayment, 4% were missing residence, and 2% were missing ZIP code median income. Data are presented as mean ± SEM or as percentages.