Several epidemiological studies suggested an increased risk of cancer and other tumors in individuals undergoing computed tomography (CT) examination during childhood; however, it was questioned whether the group undergoing CT was comparable to that not undergoing CT. To address this issue, we investigated the reasons for undergoing CT in 763 children aged 0 to 19 years in 2013. Their medical records were fully evaluated and symptoms, underlying conditions, reasons for CT, and clinical courses after CT were investigated. Among the 763 children, 66.1% underwent repeat CT after the first examination, and 19.3% underwent CT 8 times or more. Among all the examined children, 8.8% had cancer and 4.7% had cancer-prone conditions such as Down syndrome, tuberous sclerosis, and cirrhosis. Only 11.4% of the 763 children underwent CT because of trauma, and 32.2% of the children had some types of congenital anomaly. The rate of trauma decreased with an increase in the frequency of CT examinations. Since the incidence of congenital anomalies is below 2.5% in the general population, it was concluded that the population of children undergoing CT is completely different from that not undergoing CT. The 2 groups should not be compared.

中文翻译：

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儿童期接受CT的原因：可以比较CT暴露人群和未接受CT的人群吗？

几项流行病学研究表明，儿童时期接受计算机断层扫描（CT）检查的个体患癌症和其他肿瘤的风险增加。然而，有人质疑接受CT检查的人群与未接受CT检查的人群是否具有可比性。为了解决这个问题，我们在2013年调查了763名0至19岁的儿童进行CT的原因。对他们的病历进行了全面评估，并对症状，潜在病情，CT的原因以及CT后的临床过程进行了调查。在763名儿童中，有66.1％的儿童在第一次检查后进行了CT重复检查，有19.3％的孩子进行了8次或更多次CT检查。在所有接受检查的儿童中，8.8％患有癌症，4.7％患有癌症易感性疾病，例如唐氏综合症，结节性硬化症和肝硬化。在763名儿童中，只有11.4％因外伤接受了CT检查，而32名。2％的儿童患有某些类型的先天性异常。创伤率随着CT检查频率的增加而降低。由于一般人群中先天性异常的发生率低于2.5％，因此可以得出结论，接受CT的儿童人数与未接受CT的儿童人数完全不同。这两个组不应进行比较。