Bullying in the workplace can reduce the mental health of working people. It can also harm the organisations where these people work. There has been much research about bullying in the workplace. However, most studies have looked at how to manage bullying once it has happened, rather than trying to stop it happening in the first place. Many people who have been bullied choose to leave their job rather than face up to the bully. It is important to know if the actions workplaces take to prevent bullying are effective.
Our review question
What are the benefits of different ways of trying to prevent bullying in the workplace?
What the studies showed
We included five studies conducted with 4116 participants that measured being victim of bullying or being a bully and consequences of bullying such as absenteeism. We classified two interventions as organisational-level, two as individual-level and one as multi-level. There were no studies about interventions conducted at the society/policy level.
Two studies found that organisational interventions increased civility, the opposite of bullying, by about five percent. One of these studies also showed a reduction in coworker and supervisor incivility. They also found that the average time off work reduced by over one third of a day per month.
An expressive writing task with 46 employees, showed a reduction in the amount of bullying. A cognitive behavioural educational intervention was conducted with 60 employees who had a learning disability, but there was no significant change in bullying.
One study evaluated a combination of education and policy interventions across five organisations and found no significant change in bullying.
What is the bottom line?
This review shows that organisational and individual interventions may prevent bullying in the workplace. However, the evidence is of very low quality. We need studies that use better ways to measure the effect of all kinds of interventions to prevent bullying.
There is very low quality evidence that organisational and individual interventions may prevent bullying behaviours in the workplace. We need large well-designed controlled trials of bullying prevention interventions operating on the levels of society/policy, organisation/employer, job/task and individual/job interface. Future studies should employ validated and reliable outcome measures of bullying and a minimum of 6 months follow-up.
Bullying has been identified as one of the leading workplace stressors, with adverse consequences for the individual employee, groups of employees, and whole organisations. Employees who have been bullied have lower levels of job satisfaction, higher levels of anxiety and depression, and are more likely to leave their place of work. Organisations face increased risk of skill depletion and absenteeism, leading to loss of profit, potential legal fees, and tribunal cases. It is unclear to what extent these risks can be addressed through interventions to prevent bullying.
To explore the effectiveness of workplace interventions to prevent bullying in the workplace.
We searched: the Cochrane Work Group Trials Register (August 2014); Cochrane Central Register of Controlled Trials (CENTRAL; The Cochrane Library 2016, issue 1); PUBMED (1946 to January 2016); EMBASE (1980 to January 2016); PsycINFO (1967 to January 2016); Cumulative Index to Nursing and Allied Health Literature (CINAHL Plus; 1937 to January 2016); International Bibliography of the Social Sciences (IBSS; 1951 to January 2016); Applied Social Sciences Index and Abstracts (ASSIA; 1987 to January 2016); ABI Global (earliest record to January 2016); Business Source Premier (BSP; earliest record to January 2016); OpenGrey (previously known as OpenSIGLE-System for Information on Grey Literature in Europe; 1980 to December 2014); and reference lists of articles.
Randomised and cluster-randomised controlled trials of employee-directed interventions, controlled before and after studies, and interrupted time-series studies of interventions of any type, aimed at preventing bullying in the workplace, targeted at an individual employee, a group of employees, or an organisation.
Three authors independently screened and selected studies. We extracted data from included studies on victimisation, perpetration, and absenteeism associated with workplace bullying. We contacted study authors to gather additional data. We used the internal validity items from the Downs and Black quality assessment tool to evaluate included studies' risk of bias.
Five studies met the inclusion criteria. They had altogether 4116 participants. They were underpinned by theory and measured behaviour change in relation to bullying and related absenteeism. The included studies measured the effectiveness of interventions on the number of cases of self-reported bullying either as perpetrator or victim or both. Some studies referred to bullying using common synonyms such as mobbing and incivility and antonyms such as civility.
Organisational/employer level interventions
Two studies with 2969 participants found that the Civility, Respect, and Engagement in the Workforce (CREW) intervention produced a small increase in civility that translates to a 5% increase from baseline to follow-up, measured at 6 to 12 months (mean difference (MD) 0.17; 95% CI 0.07 to 0.28).
One of the two studies reported that the CREW intervention produced a small decrease in supervisor incivility victimisation (MD -0.17; 95% CI -0.33 to -0.01) but not in co-worker incivility victimisation (MD -0.08; 95% CI -0.22 to 0.08) or in self-reported incivility perpetration (MD -0.05 95% CI -0.15 to 0.05). The study did find a decrease in the number of days absent during the previous month (MD -0.63; 95% CI -0.92 to -0.34) at 6-month follow-up.
Individual/job interface level interventions
One controlled before-after study with 49 participants compared expressive writing with a control writing exercise at two weeks follow-up. Participants in the intervention arm scored significantly lower on bullying measured as incivility perpetration (MD -3.52; 95% CI -6.24 to -0.80). There was no difference in bullying measured as incivility victimisation (MD -3.30 95% CI -6.89 to 0.29).
One controlled before-after study with 60 employees who had learning disabilities compared a cognitive-behavioural intervention with no intervention. There was no significant difference in bullying victimisation after the intervention (risk ratio (RR) 0.55; 95% CI 0.24 to 1.25), or at the three-month follow-up (RR 0.49; 95% CI 0.21 to 1.15), nor was there a significant difference in bullying perpetration following the intervention (RR 0.64; 95% CI 0.27 to 1.54), or at the three-month follow-up (RR 0.69; 95% CI 0.26 to 1.81).
A five-site cluster-RCT with 1041 participants compared the effectiveness of combinations of policy communication, stress management training, and negative behaviours awareness training. The authors reported that bullying victimisation did not change (13.6% before intervention and 14.3% following intervention). The authors reported insufficient data for us to conduct our own analysis.
Due to high risk of bias and imprecision, we graded the evidence for all outcomes as very low quality.