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