Neuroticism, a central link between somatic and psychiatric morbidity: path analysis of prospective data.
BACKGROUND
Neuroticism and somatic complaints are linked, and the aim of this study is to disentangle which mechanisms may be responsible for this association.


METHODS
In a stratified sample of 7076 adults (18-65 years), neuroticism, 22 self-reported chronic somatic conditions and five broad CIDI-diagnosed psychiatric syndromes were assessed at baseline and, in 3625 (51%) subjects, 3 years later. Using path analysis we examined whether neuroticism has direct links with future somatic morbidity and, conversely, whether morbidity at baseline is linked with higher neuroticism later on.


RESULTS
Neuroticism at baseline is associated with psychiatric and somatic morbidity at follow-up after 3 years (31% and 24%, respectively, are direct associations, i.e. unmediated by each other or neuroticism at follow-up and independent of morbidity at baseline). Conversely, somatic and psychiatric morbidity at baseline are associated with increased neuroticism at follow-up (27% and 15%, respectively, are direct associations).


CONCLUSIONS
Neuroticism raises risk for psychiatric and somatic morbidity but also results from them. It represents a central nexus in the process of morbidity accumulation.
Neeleman
J
J
Department of Social Psychiatry, University of Groningen, Groningen, The Netherlands. j.neeleman@med.rug.nl
Bijl
R
R
Ormel
J
J
D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000150:complications / Q000209:etiology; D008875:Middle Aged; D009497:Neurotic Disorders / Q000150:complications* / Q000209:etiology*; D011446:Prospective Studies; D011602:Psychophysiologic Disorders / Q000150:complications* / Q000209:etiology*