Original articleThe epidemiology of insomnia: Associations with physical and mental health.: The HUNT-2 study
Section snippets
Participants and procedures
All 92,100 inhabitants of Nord-Trøndelag County, Norway, aged 20–89 years, were invited to a clinical examination as part of a general health screening program: HUNT-2. Of these, 65,648 (71%) attended a physical examination, where they received a second set of questionnaires, of which 54 375 individuals (82.8% of the participants) completed the insomnia questionnaire. Due to missing data on some of the other variables used in the present study, the final sample comprised 47 700 participants
Sample characteristics
Participants were between 20 and 89 years of age, with a mean age of 49.1 years (S.D.=16.6). The sample included 53.9% women and 46.1% men. A majority of the participants were married or living with a partner (61.8%), had completed at least a high school degree (78.8%), and were employed at the time of the clinical examination (55.1%).
The prevalence of insomnia symptoms
Overall, 13.5% of the sample reported insomnia symptoms. Fig. 1 depicts the distribution of insomnia symptoms by age and gender. While less than 10% of younger
Discussion
The aims of the present study were to estimate the prevalence of insomnia symptoms in the general population across sex, age, and educational level and to describe comorbidities and correlates of insomnia. In sum, we found a total prevalence rate of 13.5%, with women and older adults reporting having more complaints. The strongest correlates of insomnia were found in mental conditions and pain conditions with uncertain etiology, followed by chronic pain and somatic conditions. All these
Acknowledgments
The Nord-Trøndelag Health Study (The HUNT-2 Study) is a collaboration between HUNT Research Centre, Faculty of Medicine, Norwegian University of Science and Technology (NTNU, Verdal); The Norwegian Institute of Public Health; and Nord-Trøndelag County Council.
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