MYERS lE , CORNELL lE . Respiratory health of bric kworkers in Cape Town , South Africa: symptom s, signs and pulmonary function abnormalities. Scand J Work Environ Health 1989;15:188-194. The respiratory health of 268 brickworkers in five brickworks was investigated by means of a questionnaire, a physical examination , and pulmonary function testing. Th e prevalence of respiratory symptoms ranged from 7 070 for chronic bronchitis to 52 070 for morning cough to 27 010 for both chest tightne ss and wheeze and 9 070 for dyspnea at effort. A stepwise logistic regression analysis showed the symptoms to be significantly predicted by combinations of smoking and exposure to dust, while a multiple linear regression showed an effect of dust exposure on forced vital capa city and forced expiratory volume in I s but no smoking effect. Smokin g generally had less of an effect than du st and predicted early/mild symptoms only .
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