thoro data frame has 2470 rows and 14 columns.
Each row represents one patient that have had cerebral angiography (X-ray of
the brain) with an injected contrast medium, either Thorotrast or
another one (the controls).id: Identification of person.
sex: Sex, 1: male / 2: female.
birthdat: Date of birth, Date variable.
contrast: Group, 1: Thorotrast / 2: Control.
injecdat: Date of contrast injection, Date variable.
volume: Injected volume of Thorotrast in ml. Control
patients have a 0 in this variable.
exitdat: Date of exit from the study, Date variable.
exitstat: Status at exit, 1: dead / 2: alive,
censored at closing of study, 20 February 1992 / 3:
censored alive at some earlier date.
cause: Cause of death. See causes in the helpfile for
gmortDK
liverdat: Date of liver cancer diagnosis, Date variable.
liver: Indicator of liver cancer diagnosis. Not all livercancers
are histologically verified, hence
liver >= hepcc + chola + hmang
hepcc: Hepatocellular carcinoma at liverdat.
chola: Cholangiocellular carcinoma at liverdat.
hmang: Haemangisarcoma carcinoma at liverdat.
}M Andersson, B Carstensen HH Storm: Mortality and cancer incidence after cerebral angiography. Radiation Research, 142, pp. 305--320, 1995.
mortDK, gmortDK