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Night Shift Work and Obesity: Baseline Results of a Prospective Cohort Study in China
Başlık:
Night Shift Work and Obesity: Baseline Results of a Prospective Cohort Study in China
Yazar:
Sun, Miaomiao, author.
ISBN:
9780438106192
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (238 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Özet:
Background.
In recent years night shift work being an occupational hazard has drawn much attention by researchers because it is a highly demanding job nature in modern world. There has been growing evidence showing a possible link between night shift work and obesity. However, the evidence was limited when considering shift work exposure into different types, especially for irregular shift work. The results were controversial for the investigation of the difference between genders in the risk of abdominal obesity, the latter has been identified as an important risk factor to metabolic syndrome and cardiovascular diseases.
Methods.
More than 5,000 participants were enrolled in 2013 and 2015 at baseline survey, with 49% of night shift employees and 51% of daytime workers. Preliminary analysis on the follow-up data of Chinese Night Shift Cohort was also conducted. Odds ratios (ORs) for overweight (BMI 24-28kg/m2) and obesity (BMI≥28kg/m2) and abdominal obesity were calculated using forward stepwise multivariable logistic regression, by adjusting for potential confounders including socio-demographic characteristics, lifestyles, working features, physical exercise habits and eating habits. For the test of interaction between years of night shift work and gender of male, relative excess risk due to interaction (RERI) was used to test for interaction on an additive scale and the ratio of ORs was used to test for the interaction on multiplicative scale.
Results.
The prevalence of overweight (BMI 24-28kg/m2) and obesity (BMI≥28kg/m2) and abdominal obesity in the baseline survey of Chinese Night Shift Cohort was demonstrated as 36.4%, 7.6% and 44.5%, respectively. A positive association was observed between night shift work and overweight (BMI 24-28kg/m2) (OR 1.14, 95%CI 1.01-1.30) or abdominal obesity (OR 1.16, 95%CI 1.02-1.31) comparing to the daytime workers. An upright trend in odds ratios for overweight (BMI 24-28kg/m2) and abdominal obesity were seen with increasing years of night shift work. Workers with who had involved more than 10 years of night shift indicated a stronger association with overweight (BMI 24-28kg/m2), obesity (BMI≥28kg/m 2) and abdominal obesity, showing odds ratios of 1.54 (95%CI 1.24-1.91), 1.55 (95%CI 1.10-2.18) and 1.62 (95%CI 1.32-2.00), respectively.
Irregular night shift work had a significant association with overweight (BMI 24-28kg/m2) (OR 1.37, 95%CI 1.04-1.81), obesity (BMI≥28kg/m 2) (OR 2.03, 95%CI 1.25-3.30) and abdominal obesity (OR 1.22, 95%CI 1.04-1.43). Whilst for the permanent night shift and rotating night shift work, the association with overweight/obesity was not statistically significant. Rotating night shift work showed an odds ratio of 1.20 (95%CI 1.01-1.43) for the association with abdominal obesity.
Using female daytime workers as the reference group, the odds ratio of female night shift workers for BMI≥24kg/m2 and abdominal obesity tend to be borderline. Male showed a higher adjusted ORs comparing to the females, especially with >10 years of shift workers (for BMI≥24 kg/m2, OR 2.02, 95%CI 1.50-2.72; for abdominal obesity, OR 1.60, 95%CI 1.19-2.15). In subgroup analyses of participants with more intensive exposure of night shift work, a statistically significant additive interaction of BMI≥24 kg/m2 was observed for the combined exposures of ">10 years of night shift work and gender of male" (RERI =1.35, 95%CI 0.04 -- 2.67). The additive scale was also seen in abdominal obesity but there was lac of statistical significance (RERI =0.49 95%CI -0.60 -- 1.57).
Night shift work indicated a weak association with metabolically unhealthy normal weight (BMI<24 kg/m2 and metabolically unhealthy components, MUCs≥2 components) (OR 1.08, 95%CI 0.83-1.41). And there was a significant relation between night shift work and metabolic healthy obesity (BMI≥24 kg/m2 and MUCs<2 components) (OR 1.36, 95%CI 1.13-1.63). Moreover, night shift workers had 1.18 times (95%CI 0.99-1.41) of contracting metabolic unhealthy obesity (BMI≥24 kg/m2 and MUCs≥2 components) than daytime workers.
After an average of three years of follow-up, night shift workers showed a higher body mass index (BMI) increasing (beta=0.13, 95%CI -0.23 - 0.29), and the risk of abdominal obesity was 1.43 (95%CI 0.75-2.73), but the results showed no statistical significance.
Conclusion.
Our study revealed that exposure to night shift work was positively associated with overweight (BMI 24-28kg/m2), obesity (BMI≥28kg/m 2) and abdominal obesity in Chinese workers. A dose-response relationship was suggested between the years of night shift work and the increased odds ratio of overweight (BMI 24-28kg/m2) and abdominal obesity. Irregular night shift work and permanent night shift work type showed a stronger relation with obesity than the rotating night shift work. Male night shift workers are more vulnerable to BMI≥24 kg/m2 than female workers.
Notlar:
School code: 1307
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