Table 2.

Risk of subsequent hospitalization among patients surviving their index hospital admission in Washington State from 2006 (second quarter) to 2008 in a fully adjusted Cox proportional hazards model (n=676,343)

Subsequent Hospitalization
Hazard Ratio99% CIPTime to First Hospitalization (Months)Full Study First HospitalizationsWithin First Month First Hospitalization
 kidney transplant1.851.68–2.03<0.00141–1273666.921219.3
All cohorts51–13291,09243.092,29013.6
  • Fully adjusted model controlling for age; sex; index hospitalization primary diagnosis, length of stay, and primary payer; 12-month count of previous hospitalizations; and Elixhauser comorbidity variables. CKD cohort defined by CKD not treated with hemodialysis, peritoneal dialysis, or kidney transplant. Dialysis cohort includes hemodialysis and peritoneal dialysis. CI, confidence interval; IQR, interquartile range.