Data from Appendix II of Breslow and Day (1980) (IARC Scientific
Publication No. 32) on a case-control study conducted by the Oxford
Childhood Cancer Registry. There are 120 records corresponding to
120 2x2 tables with entries A = no cases x-rayed, B = no cases non
x-rayed, C = no controls x-rayed, D = no controls non x-rayed.  Each
2x2 table corresponds to a stratum defined by calender year of birth
and the age at death of the case or age-sex-region matched control.
Note that the total no of cases and controls in each stratum is equal.

The entries in each record, in 7I5 format, are A,B,C,D,Z0,Z1,Z2
where the first four are the entries in each table and the last
three the covariables, coded as follows:

Z0: contstant term

Z1: Age (at death of case) coded 9=9 yrs, 7=8 yrs, 5=7 yrs, ... -9=0 yrs.

Z2: Calendar year coded -10=1944, -9=1943, ... 10=1964