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Table 7 Internal comparison between workers exposed ≥ 1 year and the non-exposed workers (white collars)

From: Health status of male steel workers at an electric arc furnace (EAF) in Trentino, Italy

Groups (N. of subjects) Observed Expected SMR 95 % CI Person Years
Exposed Workers ≥ 1 year (n.331) 29 25.69 1.13 0.76–1.62 6731.0
Non-exposed (controls) (n.32) 1 2.09 0.47 0.01–2.67 491.3
Comparison exposed/non exposed workers RR: 2.34 0.39–95.72  
Avoidable deaths 16.6 0–28.7