We included 283 919 CT scans in the analysis of leukaemia risk, of which 64% (182 337 scans) were of the head. The next most common CT scan types were of the abdomen and/or pelvis (9%, 25 695 scans) and chest CT (7%, 18 910 scans; appendix). The distribution of scan types was very similar for patients in the brain tumour analysis, but the total number of scans was slightly smaller than in the leukaemia analysis because of the longer exclusion period (279 824 scans). Table 2 lists the distributions of cases and overall person-years, by sex, age at first scan, attained age, years since first scan, and the number of scans.
We included 283 919 CT scans in the analysis of leukaemia risk, of which 64% (182 337 scans) were of the head. The next most common CT scan types were of the abdomen and/or pelvis (9%, 25 695 scans) and chest CT (7%, 18 910 scans; appendix). The distribution of scan types was very similar for patients in the brain tumour analysis, but the total number of scans was slightly smaller than in the leukaemia analysis because of the longer exclusion period (279 824 scans). Table 2 lists the distributions of cases and overall person-years, by sex, age at first scan, attained age, years since first scan, and the number of scans.
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