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Background: Suicide is one of the leading causes of death worldwide and recent statistics have shown that suicide rates were increasing among working age populations.Even if, several prospective studies have been led in this group of age, occupational factors associated with suicide are not well known and only a few of these studies deal with them.There are only three prospective studies on these factors.It was thus shown that a high psychological demand, low control and work stress combined to home stress were associated with an increased risk of suicide.For each of these studies, only suicidal behaviours were measured overtime and occupational factors were only measured once, at baseline.Thus, these studies did not take into account that these risk factors could change over time.The same limitation has been noticed for the determination of other risk factors of suicide.Our objective was to determine occupational and personal factors associated with suicide mortality in the GAZEL cohort, a population-based cohort of employees of Electricity-Gas of France.Methods: The GAZEL cohort is a population-based cohort of employees of Electricity-Gas of France.In 1989, 20 624 employees aged between 35 and 50 were included and followed since then.Data were collected using an annual self-questionnaire.Causes of death were recorded by the French registry of mortality (CepiDC).The risk of suicide was then analyzed using survival analysis with time varying covariates.Results: Between 1989 and 2007, 1194 deaths were recorded.Of them, 67 were suicides, corresponding to 6.4 % of the total number of deaths.Suicide was associated with feeling depressed during the previous year (RR=10.3), being male (RR=4.1), smoking (RR=2.5), living alone (RR=1.3).By contrast, social support (RR=0.1), retirement (RR=0.4) and coffee drinking (RR=0.5) were associated with a decreased risk of suicide.The age, the number of children, community life, life events, sleep disorders and absenteeism were not significantly associated with the risk of suicide.We did not find any effect neither for the following occupational factors: professional category, mental fatigue at work, physical fatigue at work, advancement and work on call.Discussion: In our study, the strongest predictors of suicide were feeling distressed during the previous year and social support, as it has already been shown in previous studies.Among occupational factors, retirement was associated with a decrease risk of suicide.Retirement may allow people to engage more time in stimulating and restorative activities.However, employees of EDF-GDF retired at 55 or close to that age, owing to generous retirement policies of this company.The generalisability of this result to other countries and settings should be tested.