title: The association between shift work and hyperuricemia in steelmaking male workers.
abstract: OBJECTIVE
  The aim of this study was to examine the association between shift work and hyperuricemia among steel company workers.
  
  
  METHODS
  We examined 1,029 male workers at a Korean steel company between June 6 and June 28, 2013. We conducted anthropometric measurements, questionnaire surveys, and blood tests. Hyperuricemia was defined as a serum uric acid concentration of ≥7.0 mg/dL. Logistic regression analyses were performed. In the full model, analysis was adjusted for covariates including age, body mass index, lifestyle factors, and comorbidities. The odds ratios (ORs) and 95% confidence intervals (95% CIs) were calculated for all models.
  
  
  RESULTS
  The participants included 276 daytime workers and 753 shift workers. Among daytime workers, 72 (26.1%) individuals had hyperuricemia, as did 282 (37.5%) individuals among shift workers (p <0.001). There was a statistically significant association between shift work and hyperuricemia. In the unadjusted model, the OR of shift work was 1.70 (95% CI 1.25-2.31) for hyperuricemia. In the full model, the OR of shift work was also statistically significant after adjustment for covariates (OR 1.41, 95% CI 1.02-1.96).
  
  
  CONCLUSIONS
  Among male steel workers, a significant association between shift work and hyperuricemia was observed.
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Jae-Seok
authors.initials: JS
authors.lastname: Oh
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Won-Jun
authors.initials: WJ
authors.lastname: Choi
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Min-Kee
authors.initials: MK
authors.lastname: Lee
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Han
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Song
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Jong-Wan
authors.initials: JW
authors.lastname: Yun
authors.affiliation: Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, 72-39, Namdong-daero 239beon-gil, Namdong-gu, Incheon, Korea.
authors.forename: Sang-Hwan
authors.initials: SH
authors.lastname: Han
keywords: Hyperuricemia; Job schedule; Shift work