Dataset Information

Night Shift Work, Genetic Risk, and Type 2 Diabetes in the UK Biobank.

ABSTRACT: OBJECTIVE:To examine the effects of past and current night shift work and genetic type 2 diabetes vulnerability on type 2 diabetes odds. RESEARCH DESIGN AND METHODS:In the UK Biobank, we examined associations of current (N = 272,214) and lifetime (N = 70,480) night shift work exposure with type 2 diabetes risk (6,770 and 1,191 prevalent cases, respectively). For 180,704 and 44,141 unrelated participants of European ancestry (4,002 and 726 cases, respectively) with genetic data, we assessed whether shift work exposure modified the relationship between a genetic risk score (comprising 110 single-nucleotide polymorphisms) for type 2 diabetes and prevalent diabetes. RESULTS:Compared with day workers, all current night shift workers were at higher multivariable-adjusted odds for type 2 diabetes (none or rare night shifts: odds ratio [OR] 1.15 [95% CI 1.05-1.26]; some nights: OR 1.18 [95% CI 1.05-1.32]; and usual nights: OR 1.44 [95% CI 1.19-1.73]), except current permanent night shift workers (OR 1.09 [95% CI 0.93-1.27]). Considering a person's lifetime work schedule and compared with never shift workers, working more night shifts per month was associated with higher type 2 diabetes odds (<3/month: OR 1.24 [95% CI 0.90-1.68]; 3-8/month: OR 1.11 [95% CI 0.90-1.37]; and >8/month: OR 1.36 [95% CI 1.14-1.62]; Ptrend = 0.001). The association between genetic type 2 diabetes predisposition and type 2 diabetes odds was not modified by shift work exposure. CONCLUSIONS:Our findings show that night shift work, especially rotating shift work including night shifts, is associated with higher type 2 diabetes odds and that the number of night shifts worked per month appears most relevant for type 2 diabetes odds. Also, shift work exposure does not modify genetic risk for type 2 diabetes, a novel finding that warrants replication.

SUBMITTER: Vetter C

PROVIDER: S-EPMC5860836 | biostudies-other | 2018 Apr

REPOSITORIES: biostudies-other

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Night Shift Work, Genetic Risk, and Type 2 Diabetes in the UK Biobank.

Vetter Céline C Dashti Hassan S HS Lane Jacqueline M JM Anderson Simon G SG Schernhammer Eva S ES Rutter Martin K MK Saxena Richa R Scheer Frank A J L FAJL

Diabetes care 20180212 4

<h4>Objective</h4>To examine the effects of past and current night shift work and genetic type 2 diabetes vulnerability on type 2 diabetes odds.<h4>Research design and methods</h4>In the UK Biobank, we examined associations of current (<i>N</i> = 272,214) and lifetime (<i>N</i> = 70,480) night shift work exposure with type 2 diabetes risk (6,770 and 1,191 prevalent cases, respectively). For 180,704 and 44,141 unrelated participants of European ancestry (4,002 and 726 cases, respectively) with ge ...[more]

PMID: 29440150

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Project description:ObjectivesTo prospectively evaluate the joint association of duration of rotating night shift work and lifestyle factors with risk of type 2 diabetes risk, and to quantitatively decompose this joint association to rotating night shift work only, to lifestyle only, and to their interaction.DesignProspective cohort study.SettingNurses' Health Study (1988-2012) and Nurses' Health Study II (1991-2013).Participants143?410 women without type 2 diabetes, cardiovascular disease, or cancer at baseline.ExposuresRotating night shift work was defined as at least three night shifts per month in addition to day and evening shifts in that month. Unhealthy lifestyles included current smoking, physical activity levels below 30 minutes per day at moderate to vigorous intensity, diet in the bottom three fifths of the Alternate Healthy Eating Index score, and body mass index of 25 or above.Main outcome measuresIncident cases of type 2 diabetes were identified through self report and validated by a supplementary questionnaire.ResultsDuring 22-24 years of follow-up, 10?915 cases of incident type 2 diabetes occurred. The multivariable adjusted hazard ratios for type 2 diabetes were 1.31 (95% confidence interval 1.19 to 1.44) per five year increment of duration of rotating night shift work and 2.30 (1.88 to 2.83) per unhealthy lifestyle factor (ever smoking, low diet quality, low physical activity, and overweight or obesity). For the joint association of per five year increment rotating night shift work and per unhealthy lifestyle factor with type 2 diabetes, the hazard ratio was 2.83 (2.15 to 3.73) with a significant additive interaction (P for interaction <0.001). The proportions of the joint association were 17.1% (14.0% to 20.8%) for rotating night shift work alone, 71.2% (66.9% to 75.8%) for unhealthy lifestyle alone, and 11.3% (7.3% to 17.3%) for their additive interaction.ConclusionsAmong female nurses, both rotating night shift work and unhealthy lifestyle were associated with a higher risk of type 2 diabetes. The excess risk of rotating night shift work combined with unhealthy lifestyle was higher than the addition of risk associated with each individual factor. These findings suggest that most cases of type 2 diabetes could be prevented by adhering to a healthy lifestyle, and the benefits could be greater in rotating night shift workers.

Dataset Information

Night Shift Work, Genetic Risk, and Type 2 Diabetes in the UK Biobank.

Publications

Night Shift Work, Genetic Risk, and Type 2 Diabetes in the UK Biobank.

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