A study of the prevalence of respiratory morbidity among agate workers
Tóm tắt
A random sample of 342 workers engaged in chipping and grinding of agate stones were surveyed in a cross-sectional study to assess the prevalence of respiratory morbidity in the agate industry. The findings were compared with those obtained in controls. The study showed a significantly higher prevalence of lung diseases among agate workers than among controls (63.4% vs 35.5%, P < 0.001). The respiratory morbidity in agate workers and controls was maximal in the group aged 31+ years (83.3% and 42.2%, respectively). The prevalence of pneumoconiosis in agate workers (18.4%) was highly significant as compared with controls, in whom not a single case was found (P < 0.001). However, there was no significant difference between the prevalence of pneumoconiosis in men and women of the exposed group (17.9% vs 19.6%). Among the cases of pulmonary diseases in agate workers, pneumoconiosis formed the largest group (18.4%), whereas among controls it was tuberculosis (12.1%). The prevalence of pulmonary tuberculosis was very high in both agate workers and controls (15.5% and 12.1%, respectively), probably because of poor socio-economic and unhygienic living conditions. The prevalence of chronic bronchitis was found to be higher among the control population as compared with the exposed group (6.7% vs 2.6%). It therefore appeared that agate dust had no role in precipitating chronic bronchitis. However, bronchial asthma appeared to have been aggravated due to agate dust, as the risk among agate workers was 7-fold that found among the controls. The prevalence of pneumoconiosis showed a dose-response relationship in both male and female agate workers. Pulmonary tuberculosis and bronchial asthma did not show any significant trend in relation to the duration of exposure. Other lung diseases were also independent of exposure. As far as occupations are concerned, grinders were found to suffer more from pneumoconiosis (21.9%) than did chippers (7.3%, P < 0.05); this was because the respirable dust concentration at the workplace of grinders was 6-fold that at the workplace of chippers. Acute bronchitis was also more prevalent in grinders (P < 0.05). However, tuberculosis and asthma did not vary significantly between the two occupational groups.
Tài liệu tham khảo
Chandra H, Clerk SH, Gupta BN, Rastogi SK (1984) Biological and industrial hygiene studies in agate workers. ITRC, Lucknow
Gupta SP, Garg AK, Gupta OP (1969) Silicosis amongst stone cutters. J Assoc Physicians India 17:163–169
Gupta SP, Bajaj A, Jain AL, Vasudev YL (1972) Clinical and radiological studies in silicosis based on a study of the diseases among stone cutters. Ind J Med Res 60:1308–1315
Gupta SP, Bajaj Y, Bhagwan S (1976) Simple lung function studies in silicosis amongst stone cutters. Indian J Chest Dis Allied Sci 18:73–82
Gupta BN, Clerk SH, Chandra H, Rastogi SK, Singh KP, Mahendra PN (1983) Respiratory morbidity in agate workers — a case study of Khambhat. IRTC, Lucknow
International Labour Office (1980) Guidelines for the use in ILO international classification of radiographs of pneumoconiosis, revised edn (Occupational safety and health series 22). International Labour Office, Geneva
Jain SM, Sepaha GC, Khare KC, Dubey VS (1977) Silicosis in slate pencil workers: a clinico-radiologic study. Chest 71:423–428
Jain SM, Sepaha GC, Khare KC, Dubey VS (1979) Ventilatory functions and sputum cytology in slate pencil worker silicosis. Indian Chest Dis Allied Sci 21:103–109
Medical Research Council (1965) Definition and classification of chronic bronchitis for clinical and epidemiological purposes. Lancet I:775–779
Pump KK (1968) Studies in silicosis of the human lung. Dis Chest 53:237–246
Rastogi SK, Clerk SH (1983) Pulmonary function in relation to radiological categories of pneumoconiosis in agate workers. Indian J Occup Health 26:10–17
Rastogi SK, Gupta BN, Mathur N (1988) Pulmonary effects of silica dust in asymptomatic agate workers. Indian J Environ Prot 8:244–247
Rastogi SK, Gupta BN, Mathur N, Husain T, Mahendra PN (1990) Pulmonary function study in female grinders exposed to agate dust. Toxicol Ind Health 6:145–154
Saini RK, Yousuf M, Allakaband GQ, Kaul SN (1984) Silicosis in stone cutters in Kashmir. J Indian Med Assoc 82:198–201
Saiyed HN, Parikh DJ, Ghodasara NB, Sharma YK, Patel GC, Chatterjee BB (1985) Silicosis in slate pencil workers: I. An environmental and medical study. Am J Ind Med 8:127–132
Sartorelli EA (1966) Assessment of lung function in pneumoconiosis. In: Respiratory function tests in pneumoconiosis. (Occupational and health series 6). International Labour Office, Geneva, pp 21–33
Snedecor GW, Cochran WG (1967) Statistical methods, 6th edn. Iowa State University Press, Ames, Iowa, pp 258–298
Sood NK, Sachdeva JR, Hans JS, Siddhu LS (1984) Study of prevalence of silicosis and other lung diseases and pulmonary function derangement in workers employed in stone crushing in Zirakpur of Patiala district, Punjab and adjoining areas. Medical Thesis, Punjabi University, Patiala
Talvitie NA (1951) Determination of quartz in presence of silicates using phosphoric acid. Anal Chem 23:623
Teculescu DB, Stanescu DC, Pilat L (1967) Pulmonary mechanics in silicosis. Arch Environ Health 14:461–468