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Sample of (N=797) very preterm infants randomized to a form of ventilation

Johnson AH, Peacock JL, Greenough A, Marlow N, Limb ES, Marston L et al. High- frequency oscillatory ventilation for the prevention of chronic lung disease of prematurity. N Engl J Med 2002; 347:633–642.
Information on time until death or oxygen dependency
Data dictionary:

Each row contains the following 3 variables for every person.

Name Interpretation Data type Permitted Values
days Days until death or censoring Numeric 0 or positive integers
died Vital status Numeric 0 = Alive; 1 = Died
vent Mode of ventilation Character CV = conventional ventilation; HFOV = High frequency oscillatory ventilation