Description

A matched case control study carried out to investigate the connection between X-ray usage and acute myeloid leukemia in childhood. The pairs are matched by age, race and county of residence.

Usage

Format

A data frame with 238 observations on the following 11 variables.

ID

a factor denoting the matched pairs

disease

0=control, 1=case

Sex

F or M

downs

Presence of Downs syndrome: no or yes

age

Age in years

Mray

Did the mother ever have an Xray: no or yes

MupRay

Did the mother have an Xray of the upper body during pregnancy: no or yes

MlowRay

Did the mother have an Xray of the lower body during pregnancy: no or yes

Fray

Did the father ever have an Xray: no or yes

Cray

Did the child ever have an Xray: no or yes

CnRay

Total number of Xrays of the child 1=none < 2=1 or 2 < 3=3 or 4 < 4= 5 or more

Source

Chap T. Le (1998) "Applied Categorical Data Analysis" Wiley.