Table 1.

Characteristics of patients hospitalized in Washington State from 2006 (second quarter) to 2008 (n=676,343)

Index HospitalizationReference (n=641,242)CKD (n=27,870)Dialysis (n=6131)Transplant (n=1100)
MeanSDMeanSDMeanSDMeanSD
Age (yr)5918751462165413
MedianIQRMedianIQRMedianIQRMedianIQR
Length of stay (d)31–432–642–732–5
nPercentnPercentnPercentnPercent
Diabetes107,19416.710,88339.0286946.844740.6
Hypertension279,00943.520,00871.8482378.779372.1
Sex
 male294,85346.015,09854.2346056.458853.5
 female346,38954.012,77245.8267143.651246.5
Primary payer
 Medicare228,95235.718,12065.0349457.053448.5
 Medicaid53,0908.313845.05048.2615.5
 dual enrolled22,3793.514485.284813.81049.5
 commercial/HMO296,83746.3632122.7120519.739535.9
 self-pay39,9846.25972.1801.360.5
Top five primary diagnostic categories (ICD9-CM)nPercentnPercentnPercentnPercent
 circulatory diseases (390–459)113,59217.7898432.2164526.817616.0
 musculoskeletal diseases (710–739)84,18813.113474.81492.4766.9
 digestive diseases (520–579)82,80312.925659.24096.712511.4
 injury and poisoning (800–999)72,97111.421867.8107617.6807.3
 neoplasm (140–239)55,5638.79893.51232.0484.4
  • CKD cohort defined by CKD not treated by hemodialysis, peritoneal dialysis, or kidney transplant. Dialysis cohort includes hemodialysis and peritoneal dialysis. IQR, interquartile range; HMO, Health Maintenance Organization; ICD9-CM, International Classification of Diseases Ninth Revision Clinical Modification.