Table 2. Numbers of persons and CT scans by sex and age at time of examination in the AOK and KiCT data sets.
| AOK*1, 2 | KiCT-RIS | KiCT-PACS | |||||
| Persons | CTs | Persons | CTs | Persons | CTs | ||
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | ||
| Study population | 20 864 (100) | 28 993 (100) | 44 584 (100) | 71 073 (100) | 13 238 (100) | 26 212 (100) | |
| Period | 2008 | 1983–2008 | 1997–2013 | ||||
| Age range (years) | 0–12 | 0–13 | 0–12.5 | ||||
| Sex | Male | 12 019 (58) | 16 899 (58) | 26 146 (59) | 41 896 (59) | 7967 (60) | 15 816 (60) |
| Female | 8 845 (42) | 12 093 (42) | 18 387 (41) | 29 100 (41) | 5271 (40) | 10 396 (40) | |
| Unknown | – | – | 51 (0) | 77 (0) | – | – | |
| Age at CT*3 | Age category | ||||||
| 1 | – | < 1: 2547 (9) | – | < 1: 7148 (10) | – | < 0.4: 1174 (4) | |
| 2 | – | 1 ≤ 5: 7844 (27) | – | 1 ≤ 4: 18 822 (26) | – | 0.4 ≤ 2.5: 5060 (24) | |
| 3 | – | 6 ≤ 12: 18 602 (64) | – | 5 ≤ 9: 20 913 (29) | – | 2.6 ≤ 7.5: 9309 (36) | |
| 4 | – | – | – | 10 ≤ 13: 24 190 (34) | – | 7.6 ≤ 12.5: 10 669 (41) | |
*1Estimated for the German residential population, adjusted for sex and age, on the basis of data from persons insured by the AOK in the year 2008 after exclusion of persons receiving cancer-associated services in the billing year
*2Because these are extrapolated data, the totals for the individual AOK age groups may add up to less than the overall number of examinations.
*3Different age categories (1– 4) for AOK, KiCT-RIS, and KiCT-PACS
CT, computed tomography; KiCT, study on the r isk of cancer incidence in children after exposure to ionizing radiation from CT; RIS, radiological information systems;
PACS, picture archiving and communication system