Nickol K, Wade A J
Br J Radiol. 1982 Jun;55(654):399-403. doi: 10.1259/0007-1285-55-654-399.
A prospective survey of applicants for employment was undertaken to investigate the relationship between heart diameter and cardiothoracic ratio (measured in 100 mm chest radiographs) age and ethnic group, 1432 male applicants, aged 17-64 years, were studied, of whom 861 caucasians, 295 Asians and 172 African/West Indians were included in the detailed statistical analysis. A significant relationship was found between the cardiac measurements and age, which differed within ethnic groups. The median values of cardiothoracic ratio were: 43% in caucasians, 44% in Asians, and 46% in Africans. The upper extreme observations in each regression (2.5% of the population) are delimited by confidence limits plotted on the regressions against age for both cardiac diameter and cardiothoracic ratio. It is concluded that a single upper limit (e.g. 50%) for cardiothoracic ratio is unsatisfactory. If all subjects with values of cardiothoracic ratio greater than 50% in the present sample had been recalled for more detailed cardiological investigation, this would have affected 2.2% of caucasians, 4.1% of Asians, and 9.3% of Africans. Limits of 50% in caucasians, 52% in Asians and 53% in Africans would exclude 2.2, 2.4 and 2.6% of subjects in each of these racial groups in our sample. Age accounted for relatively little of the variation observed.
对求职者进行了一项前瞻性调查，以研究心脏直径与心胸比率（在100mm胸部X光片上测量）、年龄和种族之间的关系。研究了1432名年龄在17至64岁之间的男性求职者，其中861名白种人、295名亚洲人和172名非洲/西印度人被纳入详细的统计分析。发现心脏测量值与年龄之间存在显著关系，且在不同种族群体中有所不同。心胸比率的中位数分别为：白种人43%，亚洲人44%，非洲人46%。每次回归中的极端上限观察值（占总体的2.5%）由针对心脏直径和心胸比率与年龄的回归绘制的置信限界定。得出的结论是，心胸比率单一的上限（如50%）并不令人满意。如果本样本中心胸比率大于50%的所有受试者都被召回进行更详细的心脏检查，这将影响2.2%的白种人、4.1%的亚洲人和9.3%的非洲人。白种人50%、亚洲人52%和非洲人53%的上限将排除我们样本中各这些种族群体2.2%、2.4%和2.6%的受试者。年龄在观察到的变异中所占比例相对较小。
