8.The general prevalence of COPD in people aged 40 years or elder in Zhaoyuan rural area was 14.66%. The smoking prevalence was 27.8%. The prevalence of COPD in orchard farmer,stonemason,vermicelli maker,chemical plant worker,grist dust contacts,cement plant worker,mineworker,and carpenter was 20.66%,28.83%,22.79%,33.33%,30.55%,36.8%,25.8%,21.7%,respectively.
吸烟人群患病率为27.80%,木工、管理果园、加工石材、生产粉丝及接触化工、谷尘、水泥和下矿井者患病率分别为21.74%,20.86%,28.89%,22.79%,33.33%,30.55%,36.84%,25.93%,均比总体患病率高,经比较,差别均有统计学意义(P<0.05);