Warren C P, Manfreda J
Can Med Assoc J. 1980 Jun 7;122(11):1259-64.
Of a random sample of farmers in two crop districts of Manitoba mailed a respiratory questionnaire in 1976, 833 (82% of those currently farming in the area) replied. More than half were grain farmers and nearly half had never smoked cigarettes. The prevalence of chronic cough and phlegm production, wheezing and exertional dyspnea was positively related to the amount of smoking but was also higher than expected in nonsmokers. Acute dyspnea, sometimes of delayed onset and accompanied by fever, was most commonly related to handling old grain and was reported by 44% of the farmers. Current smokers were more susceptible than nonsmokers to this type of dyspnea. Farmers with history of acute dyspnea while handling grain were more likely to wear masks, but the overall rate of mask wearing, even among those at highest risk, was low.
1976年，在曼尼托巴省两个种植区随机抽取农民样本，向他们邮寄了呼吸问题调查问卷，833人（占该地区目前从事农业生产人数的82%）进行了回复。一半以上是谷物种植者，近一半从不吸烟。慢性咳嗽、咳痰、喘息和劳力性呼吸困难的患病率与吸烟量呈正相关，但在不吸烟者中也高于预期。急性呼吸困难有时起病延迟并伴有发热，最常见于处理旧谷物时，44%的农民报告有此情况。目前吸烟者比不吸烟者更容易出现这种类型的呼吸困难。有在处理谷物时出现急性呼吸困难病史的农民更有可能戴口罩，但即使在风险最高的人群中，戴口罩的总体比例也很低。
