A data frame with 6805 observations on the following 7 variables.
centera numeric code indicating in which of 67 centers the patient was treated.
ageof the patient.
beginThe month in which treatment began, with 1 representing January 1998.
endThe month in which observation terminated, either because of death or censoring.
The study ended in month 44 (August, 2000).
event1, death, or 0, censoring.
timethe difference between end and begin.
diseasea factor with levels congen, (congenital); diabetes; hypert (hypertension); other; and renal.