Relative chronic effects of different occupational dusts on respiratory indices and health of workers in three Ethiopian factories

Abstract

The respiratory effects of dusts in different sections of yarn, cement, and cigarette factories were studied in 211 nonsmoking male and female workers aged 21–57 years. The controls used were 211 healthy nonsmoking and nonexposed male and female subjects aged 20–57 years from the general population. Forced vital capacity (FVC), forced expiratory volume in 1 sec (FEV1), FEV1/FVC ratio, forced expiratory flow (FEF200–1,200 ml), forced mid‐expiratory flow (FMF25–75%) and peak expiratory flow rate (PEFR) were recorded in all subjects with and without respiratory symptoms. Taking exposures to all dusts of different concentrations together, it was found that the frequency of respiratory illness was greater among exposed workers (40.5% in males, 36% in females) than it was among controls (21.6% in males,18% in females). In exposed subjects, the symptom prevalence was only 4.5% higher in males than in females.The mean lung function indices, including FEV1, FEV1%, FEF200–1,200 ml, FMF25–75%, and PEFR, in subjects exposed to all dusts in general decreased markedly, with dust concentration being more important than duration of exposure, and FMF being affected slightly more consistently. About 38.4% of the dust‐exposed subjects developed corresponding respiratory illnesses including chronic cough (24.7%), chronic bronchitis (21.8%) and bronchial asthma (24.2%). The respective control values were 9.0%, 9.5%, and 8.5%. Exposure to different occupational dusts resulted in the development of respiratory illness with different rates of prevalence. The effects of exposure to cotton and cement dusts on respiratory health of exposed subjects were relatively more significant (p < 0.001) than that of exposure to tobacco dust (p < 0.05). Am. J. Ind. Med. 34:373–380, 1998. © 1998 Wiley‐Liss, Inc.

Excessive Exposure to Dust Among Cleaners in the Ethiopian Cement Industry

“…The age and employment distributions among the workers in our surveys were of similar magnitude to findings in other cement studies (33,36,38,41,54). Since the study included the major cement producing factories in Malaysia (33,41).…”

“…A list of studies on cement dust exposure published in scientific journals the last 15 years (except for one American study published 23 years ago) is shown in Table 1. Higher dust exposure has been reported in developing countries such as Tanzania, Ethiopia, Iran and Saudi Arabia (33,(36)(37)(38) than in USA and Norway (39,40). This difference might be caused by established regulatory actions and more advanced technical control measures in the cement industry in industrialized countries than in developing countries.…”

The impact of asthma and COPD in sub-Saharan Africa

“…selected populations such as factory workers and miners). [40][41][42] COPD is not often recognised as respiratory symptoms are frequently attributed to smoking, to respiratory infections such as tuberculosis, or to ageing. Furthermore, the term COPD is unfamiliar to the public and even to physicians in many parts of sub-Saharan Africa.…”

Prevalence of respiratory symptoms and disorders among rice mill workers in India

“…Diseases of the respiratory system induced by occupational dusts are influenced by the type of dust and duration of exposure [2]. Occupational diseases are caused by pathologic responses of the workers to their working environment [3].…”