RT Journal Article SR Electronic T1 Organisational merger and psychiatric morbidity: a prospective study in a changing work organisation JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 682 OP 687 DO 10.1136/jech.2010.126482 VO 65 IS 8 A1 Väänänen, Ari A1 Ahola, Kirsi A1 Koskinen, Aki A1 Pahkin, Krista A1 Kouvonen, Anne YR 2011 UL http://jech.bmj.com/content/65/8/682.abstract AB Background Prospective studies on the relationship between organisational merger and mental health have been conducted using subjective health indicators. The objective of this prospective occupational cohort study was to examine whether a negative change during an organisational merger is an independent predictive factor of psychiatric morbidity.Method Survey data on organisational characteristics, health and other factors were collected prior to (1996) and after the merger (2000); register data on psychiatric morbidity were collected at baseline (1/1/1994–30/9/2000) and during the follow-up (1/10/2000–31/12/2005). Participants were 6511 (77% men) industrial employees aged 21–65 years with no register-based diagnosed psychiatric events prior to the follow-up (the Still Working Study). During the follow-up, 252 participants were admitted to the hospital due to psychiatric disorders, were prescribed a psychotropic drug or attempted or committed suicide.Results A negative self-reported change in the work organisation during the merger was associated with increased risk of postmerger psychiatric event (HR 1.60, 95% CI 1.19 to 2.14). This association was independent of mental health-related factors measured before the merger announcement, such as demographic characteristics, occupational status, personal orientation to life, self-rated health, self-reported psychiatric morbidity or chronic disease.Conclusion A negative change in work organisation during an organisational merger may elevate the risk for postmerger psychiatric morbidity.