Workplace bullying and violence may increase the risk of type 2 diabetes, for both men and women, according to new research published in Diabetologia (the journal of the European Association for the Study of Diabetes [EASD]).
Previous analyses have noted that issues, such as job insecurity and long working hours, with the consequent psychological impacts, are associated with a moderately higher risk of diabetes. It has also been shown that bullying and violence can affect personal resources, such as self-esteem and the ability to cope.
In this study — carried out by Tianwei Xu, Department of Public Health, University of Copenhagen, Denmark and her collaborators from Denmark, Sweden, and Finland — the prospective relationships between workplace bullying or violence and diabetes risk were considered.
The study population was derived from four cohort studies: the Swedish Work Environment Survey (SWES), the Swedish Longitudinal Occupational Survey of Health (SLOSH), the Finnish Public Sector Study (FPS) and the Danish Work Environment Cohort Study (DWECS).
Questionnaires were used to establish exposure to workplace bullying, defined as unkind or negative behavior from colleagues, and workplace violence, defined as having been the target of violent actions or threats of violence, in the previous 12 months (note: the Finnish study referred to current bullying and did not measure violence).
Lonely young woman being gossiped about by others
The study included people employed and aged 40 to 65 years; younger participants being excluded to minimise the possible inclusion of persons with other conditions, such as type 1 diabetes. Persons diagnosed with diabetes at baseline were also excluded. The final sample consisted of 19,280 men and 26,625 women.
The incidence of type 2 diabetes (T2D) was obtained from nationwide health registers using the unique personal identification numbers for the participants in each country. Statistical analysis included an adjustment for possible confounders, such as educational level and marital status (used as an indication of social support outside work).
Adjustment for alcohol consumption, mental health problems and body mass index (BMI) were also considered, although the authors note the possible causal link between workplace negative interpersonal relationships and these factors.
Nine percent of the participants reported exposure to workplace bullying. During a mean follow up of 11.7 years, 1,223 incident cases of T2D were identified. After adjustment, being bullied at work was associated with a 46% higher risk of T2D (61% for men and 36% for women).
Adjustment for alcohol consumption and mental health difficulties did not affect this association. Adjustment for BMI removed one-third of the risk increase. Some 12% of participants had experienced violence or threats of violence in the preceding 12 months. During a mean follow up of 11.4 years, 930 participants were found to have T2D. After adjusting for confounders, workplace violence was associated with a 26% higher risk of diabetes, for both men and women. Again, adjustment for alcohol consumption and mental health problems did not affect this result.
The authors note that whilst both bullying and violence represent negative interpersonal relationships, they appear to constitute different concepts and are distinct social stressors. Bullying is psychological aggression, including behaviors such as unfair criticisms, isolation and humiliating work tasks. It is most often perpetrated by people from inside, such as colleagues. Violence, on the other hand, is more likely to involve physical acts such as pushing or kicking or the threat of these and is generally perpetrated by people from outside, such as clients, patients etc. Bullying and violence are distinct behaviors and consequently, their induced emotions can be different.
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