J Nutr Health.  2018 Dec;51(6):567-579. 10.4163/jnh.2018.51.6.567.

Mediation analysis of dietary habits, nutrient intakes, daily life in the relationship between working hours of Korean shift workers and metabolic syndrome : the sixth (2013 ~ 2015) Korea National Health and Nutrition Examination Survey

• Kim Y
• Kim HH
• Lim DH

• KMID: 2455844
• DOI: http://doi.org/10.4163/jnh.2018.51.6.567

Abstract

PURPOSE
This study examined the mediation effects of dietary habits, nutrient intake, daily life in the relationship between the working hours of Korean shift workers and metabolic syndrome.
METHODS
Data were collected from the sixth (2013-2015) Korea National Health and Nutrition Examination Survey (KNHANES). The stochastic regression imputation was used to fill missing data. Statistical analysis was performed in Korean shift workers with metabolic syndrome using the SPSS 24 program for Windows and a structural equation model (SEM) using an analysis of moment structure (AMOS) 21.0 package.
RESULTS
The model fitted the data well in terms of the goodness of fit index (GFI) = 0.939, root mean square error of approximation (RMSEA) = 0.025, normed fit index (NFI) = 0.917, Tucker-Lewis index (TLI) = 0.984, comparative fit index (CFI) = 0.987, and adjusted goodness of fit index (AGFI) = 0.915. Specific mediation effect of dietary habits (p = 0.023) was statistically significant in the impact of the working hours of shift workers on nutrient intake, and specific mediation effect of daily life (p = 0.019) was statistically significant in the impact of the working hours of shift workers on metabolic syndrome. On the other hand, the dietary habits, nutrient intake and daily life had no significant multiple mediator effects on the working hours of shift workers with metabolic syndrome.
CONCLUSION
The appropriate model suggests that working hours have direct effect on the daily life, which has the mediation effect on the risk of metabolic syndrome in shift workers.

Keyword

shift work; metabolic syndrome; dietary habits; structural equation model; mediation effect

MeSH Terms

Food Habits*
Hand
Korea*
Negotiating*
Nutrition Surveys*

Figure

• 

  Fig. 1 Research hypothesized model

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  Fig. 2 Fitted model for multiple mediators. Errors are presented with e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15, e16, e17, e18, e19, e20, e21, ee1, ee2, ee3 and ee4. b1: breakfast, b2: lunch b3: dinner, c1: food intake, c2: energy, c3: water, c15: phosphorus, c17: sodium, c18: potassium, c19: vitamin A, d1: waist circumference, d2: triglyceride, d3: fasting blood glucose, d4: blood pressure, d5: high density lipoprotein cholesterol, g1: daily life/movement ability, g2: self-management (e.g. bath, wearing clothes etc), g3: daily activity, g4: pain/discomfort. g5: anxiety/depression.

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  Fig. 3 Fitted model for multiple mediators using phantom variables. Errors are presented with e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15, e16, e17, e18, e19, e20, e21, ee1, ee2, ee3 and ee4. Pantom variables are presented with p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12 and p13. b1: breakfast, b2: lunch b3: dinner, c1: food intake, c2: energy, c3: water, c15: phosphorus, c17: sodium, c18: potassium, c19: vitamin A, d1: waist circumference, d2: triglyceride, d3: fasting blood glucose, d4: blood pressure, d5: high density lipoprotein cholesterol, g1: daily life/movement ability, g2: self-management (e.g. bath, wearing clothes etc), g3: daily activity, g4: pain/discomfort, g5: anxiety/depression

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