Mortality of iron and steel workers in Korea.
BACKGROUND
The mortality experience of iron and steel workers from modern plants in developing countries has not been extensively described.


METHODS
Mortality at two Korean iron and steel manufacturing complexes was analyzed using Poisson regression methods with both direct and indirect standardization. Work histories were linked with a national mortality registry. Workers (44,974) hired beginning in 1968 were followed from 1992 to 2001.


RESULTS
The 806 deaths observed during 10 years of follow-up comprised 2% of the population at risk and represented a large healthy worker effect (HWE) for all causes (SMR = 0.59, 95% CI = 0.55-0.63) and for cancer (SMR = 0.79, 95% CI = 0.70-0.90). Mortality at subsidiaries was considerably higher than at the parent plants (SRR = 1.71, 95% CI = 1.47-1.99). Relative mortality rates declined with employment duration: > 20 years had significantly reduced mortality (SRR = 0.59, 95% CI = 0.43-0.82) compared to duration < 1 year (test for trend: P = 0.0006). Fatal injury deaths in the first year were highly elevated (SMR = 3.10, 95% CI = 2.17-4.26) declining to less than that expected after 5 years. Cancer mortality was elevated in stainless steel production (SRR = 3.26, 95% CI = 1.37-6.49) and overall mortality was elevated for work in plant maintenance departments (SRR = 1.17, 95% CI = 1.00-1.37), particularly for fatal injuries (SRR = 1.67, 95% CI = 1.29-2.14). All-cause mortality increased with employment duration in the steel-production departments, as did fatal injuries in material handling/construction.


CONCLUSIONS
This steelworker cohort exhibits excess mortality in some process areas. More detailed retrospective exposure assessment and future follow-up of this cohort will better define health risks in the modern iron and steel manufacturing.
Park
Robert M
RM
National Institute for Occupational Safety and Health, Cincinnati, Ohio 45226, USA. rhp9@cdc.gov
Ahn
Yeon-Soon
YS
Stayner
Leslie T
LT
Kang
Seong-Kyu
SK
Jang
Jae-Kil
JK
D002318:Cardiovascular Diseases / Q000401:mortality*; D015989:Healthy Worker Effect; D006801:Humans; D007501:Iron; D007723:Korea; D008669:Metallurgy; D017202:Myocardial Ischemia / Q000401:mortality; D009369:Neoplasms / Q000401:mortality*; D009784:Occupational Diseases; D012044:Regression Analysis; D012189:Retrospective Studies; D013232:Steel; D020521:Stroke / Q000401:mortality
D013232:Steel; D007501:Iron