Erratum to: Radiat Environ Biophys (2015) 54:1–12 DOI 10.1007/s00411-014-0580-3

When performing an additional follow up of our cohort study [1], [2] we discovered two errors.

First, Table 1 and Table 2 included 44,584 patients who were eligible for the study but did not fulfil all criteria for the analysis. However, for the final analysis only 39,184 persons and 63,214 CT examinations were included. Tables 1 and 2 with the numbers of persons included in the analysis are given below.

Table 1 Number of individuals excluded and included into the analyses and characteristics of included individuals by sex, final exposure frequency and year of birth
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Table 2 Number and proportion of individuals by exposed body regions and by final exposure frequency
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Secondly, we found one case of lymphoma which was wrongly included twice in the analysis as the child was treated in three hospitals. The total number of cases that should be correctly included in the analysis is 38 (not 39), the corresponding number of lymphoma is 10 (not 11). Consequently the estimates for “all cancer” and “lymphoma” changed slightly, whereas results for leukaemia, CNS, and other solid tumours are not altered (new tables are given below). Accordingly the numbers in Tables 3, 4, 5, 6 and 7 changed and the number of person years slightly decreased from 161,407.41 to 161,406.65.

Table 3 Availability of radiology reports or medical data from the German Childhood Registry for cancer cases and randomly drawn non-cases and distribution of persons with data indicating early cancers or higher risk for cancer after 2 years’ latency
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Table 4 Number of observed cancer cases by cancer type for inclusion based on the German Childhood Cancer Registry and after the use of additional medical data for 2 years’ latency
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Table 5 SIRs for all cancer, leukaemia, lymphoma, CNS tumours and solid cancer separately including and excluding persons at high risk for cancer after 2 years’ latency
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Table 6 SIRs by exposure frequency for all cancer, leukaemia, lymphoma, CNS tumours and solid cancer including persons at high risk for cancer after two years’ latency
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Table 7 Comparison of the cohort composition and the risk estimates for leukaemia and CNS or brain tumours for three published epidemiological cohort studies on cancer risk after CTs in childhood and the presented study from Germany
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Additionally we would like to correct the name of one author. It should be J. Schlick and not I. Schlick.