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Occupational Medicine 1992;42:30-32
© 1992 Society of Occupational Medicine

research-article

Dehydration from outdoor work and urinary stones in a tropical environment

Ng Tze Pin, Ng Yuen Ling and Lee Hock Siang

Department of Community, Occupational and Family Medicine, National University of Singapore Singapore
Industrial Health Department, Ministry of Labour Singapore

A questionnaire survey was carried out to determine the prevalence of urinary stone disease in 406 male workers in several occupations. There were 119 quarry drilling and crusher workers (outdoor, physically active), 77 quarry truck and loader drivers (outdoor, physically inactive), 92 postal deliverymen (outdoor, physically active), 75 postal clerks (indoor, physically inactive), and 43 hospital maintenance workers (indoor, physically active). The prevalence of urinary stone disease was five times higher in outdoor workers (5.2 per cent) compared to indoor workers (0.85 per cent, P<0.05). Contrary to expectation, no increased risk of urolithiasis was apparent in physically inactive workers. Chronic dehydration is likely to be the most important risk factor for the increased risk of urolithiasis in outdoor workers in the tropics, and should be easily prevented by increased water intake.

Correspondence and reprint requests to: Dr Ng Tze Pin, Department of Community, Occupational and Family Medicine, National University of Singapore, Lower Kent Ridge Road, Singapore 0511, Republic of Singapore


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