Kaczmarek R G, Moore R M, Keppel K G, Placek P J
Center for Devices and Radiological Health (CDRH) of the Food and Drug Administration, Rockville, MD 20852.
Am J Public Health. 1989 Jan;79(1):75-7. doi: 10.2105/ajph.79.1.75.
Based on 1963 and 1980 National Natality Surveys, the rate of medical x-ray examinations during pregnancy per 100 mothers fell 34.2 percent. A decrease in chest x-ray examinations accounted for almost all of the decline in total x-ray examinations. The reductions were greater for older mothers and those who were not White. While the number of births fell from 4,071,000 in 1963 to 3,612,000 in 1980, the number of pelvimetry examinations actually increased by 45,000.
根据1963年和1980年的全国出生情况调查，每100名母亲在孕期接受医学X光检查的比例下降了34.2%。胸部X光检查的减少几乎占了X光检查总数下降的全部原因。年龄较大的母亲以及非白人母亲的检查次数减少幅度更大。虽然出生人数从1963年的407.1万下降到了1980年的361.2万，但骨盆测量检查的次数实际上增加了4.5万。
