TY - JOUR T1 - Shift work and age as interactive predictors of body mass index among offshore workers JO - Scandinavian Journal of Work, Environment & Health PY - 2002/2VL - 28 IS - 1 SP - 64 EP - 71 AU - Parkes, Katherine R M3 - doi: 10.5271/sjweh.648 UR - https://www.sjweh.fi/show_abstract.php?abstract_id=648 KW - age KW - body mass index KW - body weight KW - demographic factor KW - health behavior KW - job type KW - night work KW - occupation KW - offshore worker KW - shift work KW - smoking N2 - '

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OBJECTIVES ': 'This study investigated shift pattern (day shifts versus day-night rotation) and its interactions with age, and with the years of shiftwork exposure, as predictors of body mass index (BMI).

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METHODS ': 'Survey data were collected from offshore personnel working day shifts (N=787) or day-night shifts (N=787); information was obtained about shift pattern and years of shiftwork exposure, height, weight, demographic factors, and smoking habits. Hierarchical multiple regression was used to test a model in which BMI was predicted by additive and interactive effects of shift pattern, age, and exposure years with control for confounding variables.

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RESULTS ': 'In a multivariate analysis (controlling for job type, education and smoking), BMI was predicted by the main effects of age (P<0.001) and years of shiftwork exposure (P<0.02). Shift pattern was not significant as a main effect, but it interacted significantly with the curvilinear age term (P<0.025) and with the linear (P<0.05) and curvilinear (P<0.05) components of shiftwork exposure. In the day group, age but not exposure predicted BMI; the opposite was true of the day-night group. The D-N group showed a steeper increase in BMI with an increase in age and exposure years than the day group did.

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CONCLUSIONS ': 'The significant interaction effects found in this study were consistent with the view that continued exposure to day-night shift work gives rise to increases in BMI, over and above the normative effects of ageing on BMI shown by day shiftworkers.

SN - 0355-3140 ER -