Table 1.

Baseline characteristics of patients with Medicare versus no insurance at the start of dialysis ages 60–69 years old

CharacteristicNo Insurance at Day 1, n=907Medicare at Day 1, n=4388
N or MeanPercent or SDN or MeanPercent or SD
Age, yra621.4671.4
 Dual eligible00%122528%
BMI, kg/m2a,e
 18.5 to <3056262%236854%
 30 to <4024327%132130%
Albumin, g/dle
 2.5 to <316325%83226%
 3 to <3.517226%87128%
Hemoglobin category, g/dla,e
 8 to <920526%91224%
 9 to <1129637%179347%
 Coronary artery diseasea10912%98823%
 Congestive heart failurea23326%161437%
 Chronic obstructive pulmonary diseasea657%66415%
 Diabetes mellitusf50055%268861%
 Peripheral vascular diseasea768%70116%
 Prior strokea698%53512%
 Drug dependence313%1042%
 Patient institutionalizeda263%58313%
 Needs assistance with ADLs and/or inability to transfera779%87520%
Facility characteristics
 Large dialysis organizationf56062%286565%
 Facility is for profitf73781%371685%
 Facility is hospital basedf10512%3929%
Total facility patients per yearf
Full-time patient-to-nurse/technician ratio
Residence characteristics
Poverty in zip code,f %
 15 to <2531435%145133%
Less than high school education in zip code,a %
 15 to <3039143%180841%
Year of dialysis start
Season of dialysis start
  • BMI, body mass index; ADL, Activities of Daily Living.

  • a P<0.001.

  • b Other race includes Asian, Native American, Pacific Islander, and people with unknown or missing race.

  • c Hispanic ethnicity was determined using the Centers for Medicare and Medicaid Services-2728 (CMS-2728) form.

  • d Employment status was determined using the CMS-2728 form, and it included full-time and part-time employment. Patients who were retired, students, and homemakers were categorized as not employed.

  • e The following variables had missing values: body mass index (n=39, 1% missing), serum albumin (n=1485, 28% missing), and hemoglobin concentration (n=656, 12% missing).

  • f P<0.05.