Fatemeh Bazyar - MSc Student, Department of Biostatistics, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Mohammad Gholami-Fesharaki - Assistant Professor, Department of Biostatistics, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Mohsen Rowzati - Physician of Search Disease, Worksite Follow-Up Unit, Occupational Health Center, Mobarakeh Steel Company, Isfahan, Iran

BACKGROUND: There is a small number of studies that considered the relationship between shift work (SW) and Framingham risk score (FRS). This study prospectively examined the association between SW and FRS among man workers based on the multilevel modeling approach.METHODS: This five-year prospective cohort study was done among workers (using stratified random sampling) who work in Esfahan’s Mobarakeh Steel Company (EMSC), Iran, from March ۲۰۱۱ to February ۲۰۱۵.RESULTS: The study sample included ۱۶۲۶ man workers (mean age = ۴۰.۰ ± ۶.۲). Among these subjects, ۶۵۲ (۴۰.۰۱%), ۱۸۳ (۱۱.۳%) and ۷۹۱ (۴۸.۶%) were day workers, weekly rotating shift workers and routinely rotating, respectively. After controlling unbalanced variables, there was no any significant association between SW and FRS.CONCLUSION: The results of this prospective cohort study did not show a relationship between SW and FRS. 

Framingham Risk Score, Multilevel Modeling, Prospective Cohort study, Night Shift Work, Iran