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作者调查了洛杉矶州肺癌的地理分布情况,按洛杉矶“空气污染控制区”的规定,把该州26个卫生区根据类似的污染状况,分成为13个研究区。在这13个研究区内,于1968和1969年调整年令肺癌死亡率,平均每十万人口中为55例,而在第10、12和13区内则分别为70、75和70例。这三个区互相连结,位于洛杉矶州的中南部。居民经济情况较
The authors investigated the geographical distribution of lung cancer in Los Angeles and divided the 26 health districts in the state into 13 study areas under similar pollution conditions, as stipulated by the Los Angeles Air Pollution Control Area. In the 13 study areas, the annual adjustment for lung cancer in 1968 and 1969 resulted in an average of 55 cases of lung cancer per 100 000 inhabitants compared with 70, 75 and 70 cases in sections 10, 12 and 13, respectively. The three districts are interconnected and located in the south central part of Los Angeles. Residents economic situation