title: Psychological stress and rheumatoid arthritis in parents after death of a child: a national follow-up study.
abstract: OBJECTIVE
  To examine the risk of rheumatoid arthritis (RA) in parents after the death of a child.
  
  
  METHODS
  All 21,062 parents whose child had died (younger than 18 years) between 1980 and 1996 in Denmark were included in the bereaved (exposed) cohort, and 293 745 parents matched on family structure were selected randomly from the general population for the unexposed cohort.
  
  
  RESULTS
  We observed 600 incident RA cases during the follow-up (35 in the exposed cohort, 565 in the unexposed cohort). The relative risk (RR) of first hospitalisation for RA was 0.88 [95% confidence interval (CI) 0.63-1.24]. The RR was close to 1 throughout the 18 years of follow-up.
  
  
  CONCLUSIONS
  Our findings do not support an association between severe psychological stress and RA.
authors.affiliation: The Danish Epidemiology Science Centre, Department of Epidemiology and Social Medicine, University of Aarhus, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: B
authors.initials: B
authors.lastname: Schiøttz-Christensen
authors.forename: J
authors.initials: J
authors.lastname: Olsen
mesh_terms: D001172:Arthritis, Rheumatoid / Q000453:epidemiology / Q000209:etiology / Q000523:psychology*; D001601:Bereavement; D002648:Child; D003643:Death; D003718:Denmark / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008016:Life Change Events; D008297:Male; D016017:Odds Ratio; D010290:Parents / Q000523:psychology; D012306:Risk; D013315:Stress, Psychological / Q000150:complications / Q000523:psychology*