Objective: The present study was performed to evaluate the frequencies of two kinds of examinations using a proportional sample of 262 medical institutions and to observe the factors affecting the amount of examination-related exposure. The other aim of the present study was to observe the relationship between X-ray and CT frequency with GDP per capita, which could indicate the connection between medical exposure practice and economy. Methods: A random sample was taken from a pool of 316 medical institutions, and correlation analyses were performed to identify the factors affecting the amount of examination-related exposure. A representative sample of 262 medical institutions, proportional to the distribution of hospitals across grades, was used, and a multiple linear regression model was constructed. Results: The frequencies of X-ray examinations and CT scans were 523 per 1000 people and 223 per 1000 people, respectively. The two kinds of radio-diagnostic examinations showed different patterns in their relationships with GDP per capita. The factors correlated with the amounts of exposure due to the two kinds of examinations and the outpatient and equipment numbers showed distinctive patterns in the group of grade three institutions. Conclusions: The improvement in the economy has caused a rapid increase in the use of radio-diagnostic examinations. The differences in factors correlated with the two types of examinations may stem from the workload statuses of CT scans and X-ray examinations in grade three hospitals.

中文翻译：

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X射线检查和CT扫描的频率：来自江苏省样本调查的发现。

目的：本研究旨在通过按比例抽取262家医疗机构的样本来评估两种检查的频率，并观察影响检查相关暴露量的因素。本研究的另一个目的是观察X射线和CT频率与人均GDP的关系，这可能表明医疗照射实践与经济之间的联系。方法：从316家医疗机构中随机抽取样本，并进行相关分析，以找出影响检查相关暴露量的因素。使用了262家医疗机构的代表性样本，与各年级医院的分布成正比，并构建了多元线性回归模型。结果：X射线检查和CT扫描的频率分别为每千人523个和每千人223个。两种放射诊断检查与人均GDP的关系显示出不同的模式。与这两种检查引起的接触量相关的因素，在三级机构中，门诊和设备数量显示出独特的模式。结论：经济的改善导致放射诊断检查的使用迅速增加。与这两种检查相关的因素差异可能是由于三级医院的CT扫描和X射线检查的工作量状态所致。两种放射诊断检查与人均GDP的关系显示出不同的模式。与这两种检查引起的接触量相关的因素，在三级机构中，门诊和设备数量显示出独特的模式。结论：经济的改善导致放射诊断检查的使用迅速增加。与这两种检查相关的因素差异可能是由于三级医院的CT扫描和X射线检查的工作量状态所致。两种放射诊断检查与人均GDP的关系显示出不同的模式。与这两种检查引起的接触量相关的因素，在三级机构中，门诊和设备数量显示出独特的模式。结论：经济的改善导致放射诊断检查的使用迅速增加。与这两种检查相关的因素差异可能是由于三级医院的CT扫描和X射线检查的工作量状态所致。结论：经济的改善导致放射诊断检查的使用迅速增加。与这两种检查相关的因素差异可能是由于三级医院的CT扫描和X射线检查的工作量状态所致。结论：经济的改善导致放射诊断检查的使用迅速增加。与这两种检查相关的因素差异可能是由于三级医院的CT扫描和X射线检查的工作量状态所致。