After balancing the age and sex factors of the research subjects in the two areas, it was found that there were significantly higher rates of detectable Weiqi Xu type subjects in the polluted .
方法：对广州市大气污染区(荔湾区)和大气清洁对照区(天河区)部分常住居民进行卫气虚证发病率的流行病学问卷调查，并按随机号码抽取部分血样，进行实验研究。