![]() Along with the development of technology and diversification in occupations, people no longer are devoted to traditional life cycle as in sleeping at night and working during daytime. Quality sleep has become a popular topic in the modern era. Irregular sleep pattern and systemic well-being The result of this study suggests that 24/7 lifestyle of the modern society poses health risks to the relevant people and the potential harm can be greater to white-collar workers. Shift work pattern increases the risk for periodontitis and this adverse effect is greater when white-collar workers are engaged comparing to blue-collar. Crude OR of blue-collar (OR = 3.123, CI 2.972–3.281, P < 0.05) decreased to 1.151 when interaction effect to the shift work was considered. However, following adjustment for multiple confounding factors and the interaction effect term considered, this OR (1.269) increased to 1.381 in white-collar group while it decreased to 1.198 in blue-collar. Crude OR of shift work for periodontitis was 1.269. Multivariable logistic regression analysis revealed that interaction effects are present between the terms, occupational type and work pattern. The CONTRAST statement was used to analyze the interaction effect between occupation and work patterns. A multivariable logistic regression analysis was performed using the backward elimination method. Univariable odds ratios (OR) were calculated using a logistic regression model with 95% confidence interval (CI). Participants with missing outcome variables were excluded from the analysis and a total of 32,336 participants were included in the final analysis. Data were collected from the Korea National Health and Nutrition Examination Survey conducted by the Korean Ministry of Health and Welfare for a total of nine years from 2007 to 2015. This study aimed to investigate the effects of shift work on periodontal disease in blue-and white-collar workers and to examine the interaction effects between occupation and work patterns.
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